d>"e81g/"e81l%`i:"a&'e?'
      e81l!'nz1c*"j!"t"jv'l%`i:"k~"
      7#aaa e81nt1d/"j*`i:"6"7
      
      i/"e81 ,B l%`l!'
  
  "1h3"d>1a/"*"i:"e.""1
  l%`i:"i:1kt'33 #100 qu'a&'
  e~`h!1{ft1o f*1k*"qu'qx'i:"33
  `# dv'e~`f*133m0`f*1s` n k!"e~`e."2j*1
a&'a:`s`*'k!"i:"az"j8"r3"h$"i:"dx"d!ae~`
e."- k!"f*1d>1d$"a!`2d!1kw'f*1d!aqu'i/";
d>1j3",$"h3"d>1r3"r9"k*"d3'|1*'k!"e~`e."
a!`2kw'f*1*`cy1qu'k*"e}"-
  `# d3'e~`f*133m0`f*1s` n k!"e~`e."2
j*1a&'a:"i%`s`*'k!"i:"az"j8"d!ae~`e."-
k!"f*1a:'e~`e."d/1c*"pv"dy"2e3`s`e~`e."
k4'd>1d$"a!`2d!1kw'f*1j~1o/"d!aqu'i/";
d>1j3" k k!"e~`e."a!`2d!1kw'f*1 ?n-2k/n#
d!aqu'i/";dv"d!1qu'd*'|1cy1qu'r3"e3`s`
e~`e."k4'$"h3"d>1a!`2kw'f*1*`cy1qu'k*"
e}"-
  `# e~`ft1f*1m0`f*1s` n k!"l&"k!12e|'
j~1o/"d>1d$"jw1k0`qu'2d>1j3"o/"d%"l("-
  `# i:"f*1a&'jv'l%`d!aq/"f/1k4'$1i:"*"
f/12i:"f*1r("q/"s`jv'l%`k&'i:"k*1i/"a:1-
  
  a/"h3"j~1i/`jw1f}1q>`gu1d>"e81g/"e81
l%`i:"a&'e?'k*'k?'r$"e3`s`2k?`k&'q0'y1
c*"m/"d*"i:`6"2a}`hw"jy`a/"my1b/'b/"- 
g3"h3"$1y1c*"m/"d*"i:`6"2y'i:"jt1ky's1
jw1f}1q>`gu1d>"e81g/"e81l%`i:"a&'e?'k*'
k?'r$"i/'mt"f&1*"i("j~1- 

    d*"*'o/"qu"33e~`h!1f*1{dv'e~`f*1,
d3'e~`f*1,e~`ft1f*1k&"av" #85 qu'o
  
    *',dv'e~`f*1{av" #40 qu'o 
  i3'my133d*" #a f*1a:"d*" #h f*12m0`f*1
#5 qu'- 
  #a4 s`*'dz'p%"k9"hw"c*1d*"mt" #3 k&'
b:`d!ab$1a:1j.1mt"2dz'p%"7"s`*'k!"~1a/"
ey1dz'a%"2j:`dz'a%"|`j.1mt"k)1k{`$1 
#60~.*, g/1f/1- dx'f&'dt"r("2k_'~1a%"hw"
d*"mt"ey1bz1k_'y`- k)`i!"az`k!"k_'y`k4'
hw"d*"mt"ix"2h!1j:`k_'y`d!aot'k+"$1e)"
c+"n>`*'a&`j|'et"r3"j|'et"d!ao/"qu"f/1
ey1o
  {,'jy`jv'kt"f/1j!"d*" #a +"o
  (1) a:1et" (2) ~1 (3) p%'/"et"
  (4) f3`~1 (5) i_'j|'et"
  #b4 k0`dy"e.'*"c.`dt` ,A, ,B, i:"="l&'
kt'a&'nz1i:` $t ,P,A,B ey1bz1*'az"ev'k{`
ey1d!ae3`s`dt` ,P e3`bz1d!af/1ey1$1e)"
c+"n>`*'e~`e."o
  (1) c.`k!"dt` (2) *'et"d}" 
  (3) *'a:1et" (4) *'~1 (5) *'py1mt"
  #c4 hw" (p-q)~12 av`lw'i:"a&'2 
p~9"q~3 e."d!ae*"i/"$1r!1o
  (1) -#1320 (2) -#220 (3) #12 (4) #220
  (5) #1320
  #d4 i!" f(x) $1i(`e."e*"i/"$1az"d!a:"
j:"rv1i/"2j+`f&'k3" (1, 0), (2, 0) 
c.`dt`- g3" y .k f(x) d!af/1ey1s"*1 #1
dv'$"2ey1bz1cy"*'k!"rv1i/" y .k g(x) d!a
f/1ey12h!1 f(x)+g(x) .1: #0 d!ak+`$1r!1o
  (1) #1 "k: x "k: #2
  (2) x "k: #1 r3" x .1: #2
  (3) x "k: #2 r3" x .1: #3
  (4) x "k: #1 r3" x .1: #3
  (5) x $1gu"*"i:1i/"    
  #e4 k/`dw"k&'k."a:'d%"k.'bx1qx'f*`a}'
l7"*`m(`k!"k/"dy"d!ak{`d/"e.'k+'ks"l!`
j*"b/'k?"e:"~1ey1d!aj.1mt"2s"f/1i:"6" 
#10 l7"bx1qx'f*`a}'l7"j*"bz1*'k?"e:"~1
ey1d!aj.1mt"2m0`l7"bx1qx'f*`d!abx1ot'$1 
#1 dv'$"2e.'c?1c.`l7"a}'a:'kt'k/"dy"k)1
#36~.* k{`- i:"="j:`k?"e:"~1ey1j.1mt"n0"
o/"e3`nz1g&1n>"h$"d>"~1ey1d!aov"ky"i:"
d3'i%`dv'$"o
  {,'jy`jv'kt"f/1j!"d*" #b +"o
  (1) cos #18~.* (2) ?1/2cos #18~.*#
  (3) ?1/2sin #18~.*#
  (4) ?1/2tan #18~.*#
  (5) ?1/2#tan #18~.*
  #f4 iz'?'d>"e{`{dv'$"$1qu'o0"o j|`k81
|1iz'o<'f&'k3"k+"a:1i:12e3`bv`iz'd!a)'
c*"ot"r9" (kt`bz'iz')'2dv'$"$1
?,N/m~2#)_4 *`a:'iz')' x |`iz'?'d>"e{` y
d!ak}'e*"i:"$1 y .k 
#10`*log ?x/2`*10~-5#~2, j+`m/"jt1h%"?'
k}`a:"q>`k$'qv"m(`c0"k&'bx`d!ag:"kt'iz'
?'o/"d!1b%'k3" #80 qu'o0"- g3"m(`k&'bx`
4"h3"i:1j!"d!1d!aiz'?'kx'r%`$1 #80 
qu'o0"2h!1kw'k&'bx`d!aiz')'$1d3'i%`
?,N/m~2#_8
  (1) #0.2 (2) #0.5 (3) #2 (4) #5 
  (5) #20
  #g4 ks"a:" ,,BMI d!ak*"e}"q>`i:" 8?f*`
a&"(k&'k?')/`(iu'k%'(k&'b:`)`)~2#_0, :1
;;y'k31 i/"e81k)'|1 #bjac nt1f*1b/'*'e."
e?'a:" ,,BMI d!ak*"e}"qx'q>`$1 8?f*`a&"
(k&'k?')`*1.3/`(iu'k%'(k&'b:`)`)~2.5#_04
et"s`k)`,*`,oy`ev'gu1d!af*`a&"k*1iu'k%'
g/1e)"o{`33

 63333363333333333633333333332
 l     l f*`a&"   l iu'k%'   l
 l     l {k&'k?'o l {k&'b:`o l
 r33333r3333333333r3333333333l
 l k)` l #55      l #1.63    l
 r33333r3333333333r3333333333l 
 l *`  l #68      l #1.73    l
 r33333r3333333333r3333333333l 
 l oy` l #72      l #1.79    l
 h33333h3333333333h3333333333b
 
  i:"="k)`,*`,oy`ev'gu1a&'i01d!ae?'a:"
,,BMI a:1r$"o*`ks"a:" ,,BMI a:1d>"o
  (1) k?`s`k)` (2) k?`s`*` (3) k?`s`oy`
  (4) k?`s`k)`,*` (5) k)`,*`,oy`
  #h4 k)`i!"d*"js1$1*'ov"ky" r d!ajs1
f*`2k?'k.'h3"o{'l&'kt'd!a~1dt`a:"|1js1
e?'2b:"d%"$"|1 xy py1mt"ix"2 z a(1az"e."
$1js1e?'_`az"o0`k*1qx'e."2s"ou`b/'h:`/`
et" (r/1 ",A,S,B<$a}) i:" #0 d/"ky'et"2
$"|1 xz py1mt"ix"2j+`k{' x a(1|1dt`
,S(r, 0, 0), g/1f/1- *`a:'b:"d%"ix"*'dt`
,E(?1/2#r, ?>3}/2#r, 0) $"|1d&'ky' #60
d/"2h!1d*"js1ix"$"|1d&'ky' #30 d/",o0`$`
#60 d/"d!al&'kt'dt`h3"o{'$1r!1o
  {,'jy`jv'kt"f/1j!"d*" #c +"o
  (1) (?>2}/2#r, ?1/2#r, ?1/2#r)
  (2) (?1/2#r, ?>2}/2#r, ?1/2#r)
  (3) (?>3}/2#r, ?1/2#r, ?>3}/2#r)
  (4) (?>3}/4#r, ?1/4#r, ?>3}/2#r)
  (5) (?1/4#r, ?>3}/4#r, ?>3}/2#r)

    :",d3'e~`f*1{av" #25 qu'o 
  i3'my133d*" #i f*1a:"d*" #ac f*12
m0`f*1 #5 qu'-
  #i4 e)"o{`i:"k}'k_'k|1f&`k*" #bjja nt1
d%" #bjad nt1k317"cw1fw1}'d!ac|`l!"gu1
i/"{*`}"gu1k*"o2c*"g/1 #bjac nt1cw1fw1
c|`l!"d>1 #802 }"gu1j:"2e)"f/1$1k!"nt1
d/"|`c|`l!"gu1i/"d!aa!1et"f/1- a!"k*`nt1
cw1fw1c|`l!"i/"k*'r/'d('i:"a/1nt1hz'k)'2
o/"k3"2j*1a&'m(`nt1d!a #c 8" #ad g:"fw1
}'q>'et"d*"*'k!" ,,SARS {t1a&"k*1ey"r/'
e*'d%"az"r("j41o oy"c*"2c|`l!"i/"?':1d>"
c."d!akt`i%`2a:1d%"f&1nt1 #g 8" #e g:"2
fw1}'j&1 ,,SARS kv`gv`j|'b/1my1r("2
c|`l!"jw1s"a/1nt1hz'k)'-
  (a/"33m(`nt1bz1ax`c|" (`0) .k ?dx'nt1
c|`l!"gu1i/"-jt1 #1 nt1c|`l!"gu1i/"/
jt1 #1 nt1c|`l!"gu1i/"#`*100`0)

 633333333633333333363333333363333333332
 l nt1d/" l gu1i/"  l nt1d/" l gu1i/"  l
 l        l {}"gu1o l        l {}"gu1o l
 r33333333r333333333r33333333r333333333l
 l #bjja  l #283    l #bjjb  l #298    l
 r33333333r333333333r33333333r333333333l
 l #bjjc  l #225    l #bjjd  l #295    l
 r33333333r333333333r33333333r333333333l
 l #bjje  l #338    l #bjjf  l #352    l
 r33333333r333333333r33333333r333333333l
 l #bjjg  l #372    l #bjjh  l #385    l
 r33333333r333333333r33333333r333333333l
 l #bjji  l #440    l #bjaj  l #557    l
 r33333333r333333333r33333333r333333333l
 l #bjaa  l #609    l #bjab  l #731    l
 r33333333r333333333r33333333r333333333l
 l #bjac  l #802    l #bjad  l #991    l
 h33333333h333333333h33333333h333333333b

  k317"cw1fw1}'d!ac|`l!"gu1i/"a!1et"f/1
  {,'jy`jv'kt"f/1j!"d*" #d +"o

  ku'k|"ix"i/"h:'c{"2i:"e~`b/'az"j8"e~`
e."- 
  (1) hw"fw1}'q>'et"d!ad*"*'k!" ,,SARS
oy"c*"i:" #bjjc nt1
  (2) c|`l!"k317"cw1fw1d!agu1i/"o*`jt1*'
nt1hz'k)'h$"d3'd!ai:" #bjab nt1
  (3) #bjja nt1d%" #bjad nt1k317"cw1fw1
d!ac|`l!"gu1i/"d!aa&'$"i/"e{`|1 #380 
}"gu1
  (4) #bjad nt1k317"cw1fw1c|`l!"gu1i/"
d!abz1ax`c|"b%'k3" #30`0
  (5) k317"cw1fw1c|`l!"gu1i/"d!abz1ax`
c|"*` #bjad nt1$1h$"k%'
  #aj4 *`a:'ev'j:"i:1e*"i/"rv1i/" f(x)
.k a(x+2)~3"+2(x+2)+16, j+` f(0) .k #12,
i:"e~`b/'az"j8"d!ae~`e."-
  (1) a "k #0
  (2) f(x) d!a x~2 e."e*"i/"$1 #0
  (3) y .k f(x) f/1ey1d!ad$"bz"a&'e?'$1
(2, 16)
  (4) f(-4) .k #20
  (5) y .k f(x) d!af/1ey1hw" x .k -#2
q/"k?"d!ak?"e:"a:1et"e+1c|"$1 #2
  #aa4 ev'k!"e.'*"i:1i/" a, b, c mv`h/1 
b .k ?4/5#a+?1/5#c_4 k.' a, b, c o{'i:"
hw"i/"et"ix"2i:"e~`b/'az"j8"d!ae~`e."-
  (1) b hw" a |` c a:'kt'
  (2) a d%" c d!ak|"c*1i:" a d%" b d!a
k|"c*1d!a #5 o0"
  (3) a+c .1 #2b
  (4) g3" d .k ?3/4#a+?1/4#c, h!1 d hw"
b |` c a:'kt'
  (5) g3" e .k ?4/3#a-?1/3#c, h!1 e hw"
b |` c a:'kt'
  #ab4 4"i/'b}1k?"kx`e+"r3"i:1kt'r$"i("
d%"i$`iu'd!ay`e.`2i$`iu'k("iu'i:12jw1nz1
k?"kx`e+"r3"- m(`gu1j!"c.1m(`rw`kx`m(`
g:" #24 e{`i:1a:'i:1kt' t {dv'$"33i:1o 
|`i$`iu' h {dv'$"33k&'b:`o d!ak}'e*"2
e)"o{`$1j*1dx'g:"cy1bu1 #j3jj d%"a&'/`
#ab3jj d!ao/"qu"i/"k|"-
                           
 633333333333363333333333332
 l i:1kt' (t) l i$`iu' (h) l
 r333333333333r333333333333l
 l #j3jj      l #12.5      l
 r333333333333r333333333333l 
 l #c3jj      l #15.2      l
 r333333333333r333333333333l 
 l #f3jj      l #12.5      l
 r333333333333r333333333333l 
 l #i3jj      l #9.8       l
 r333333333333r333333333333l 
 l #ab3jj     l #12.5      l
 h333333333333h333333333333b
 
  c*"g/133cy1bu1 #j3jj j!"c.1i$`iu'$1
#12.5 k&'b:`- ku'k|"ix"o{`2dx'g:"j:`rw`
kx`d!ai$`iu'|`j!"c.1i:1kt'q/1r!1az"et1
rv1i/" h(t) .k asin (bt)+12.5, j*1a&' 
a .1 #0, b .1 #0_4 *'j:`az"et1rv1i/"m<1
ey12i:"e~`b/'az"j8"d!ae~`e."-
  (1) dx'g:"d!a #ah3jj |` #bd3jj d!ai$`
iu'e.'f&1
  (2) g3"4"i/'b}1l!`hw"e)"/`m(`i:1kt'k?"
kx`e+"r3"2h!1h$"r%`d!ai:1kt'dt`8'$1 
#ae3jj
  (3) i$`iu'd>"8'm0` #6 e{`i:1e41r}1*'
j:"
  (4) j:`az"et1rv1i/"d!aau"q/1 a .1 #5
  (5) b .k ?.p/6#
  #ac4 s`*'bx`ix'bz1o%'m(`*'av`cv`r$"bx`
h%"ky`k&'bz12i_'qx'|1j*"8'n0"g&1my1dy"
e)"c+"f{18'33
  *',jt'8'r("hw"av`cv`r$"bx`a&"e)"h%"ky`
a:1hw' #1000 a/'- 
  :",cs"k!"8"r("av`cv`r$"bx`j=1r31d!ah%"
ky`a:1hw'o*`c|"e|'d>1 #95`0_4 
  bz1o%'bx`ix'ku'k|"k3"j|"a&"a:1ky't"2
q>'et"*`e)"et"e."33  
  {*'o a:1hw's"m{1a&"e)"2d*"*'k!"8"d!a
j=1r31c|"$1 #80`0_4  
  {:"o a:1hw's"m{1a&"e)"2d*"*'k!"8"j=1
r31d!aa:1hw'ky'k3"d*":"k!"8"d!aj=1r31c|"
$1 #90`0_4            
  {ev'o a:1hw's"m{1a&"e)"2c.`k!"8"r("gz1
j=1r31d!aa:1hw'h!1nz1j=1r31a:"i%`o>'k!"
8"- 
  bz1o%'bx`ix'$"c!a}1bz1j*"8'2m0`k!"8"
d*`r$"hw"e:`_1d!aa:1hw'b/"2b&1e?'o/`a&"
e?'d!as"m{1- ku'k|"ix"i/"f{1kt"2i:"e~`
b/'az"j8"d!ae~`e."- 
  (1) d*"*'k!"8"d*`bx`ix'r$"o/`a&"e?'d!a
s"m{1 #200 a/'
  (2) d*":"k!"8"d*`j=1r31d!aa:1hw'$1 
#880 a/'
  (3) m0`k!"8"d*`bx`ix'o/`a&"e?'d!as"m{1
i/"c."r$"a/1kt"kt`i%`
  (4) d*"ev'k!"8"d*`j=1r31d!aa:1hw'a&'2
nz1j=1r31d%"d*"cs"k!"8"d*`d!ao*`c|"o/"
h/1 #90`0
  (5) bz1o%'bx`ix'l!`i="c*"}1bz1j*"8'
  
    ev',e~`ft1f*1{av" #20 qu'o 
  i3'my133d*" #ad a:" #ag f*12m0`f*1
#5 qu'- e)"mt" {#ad-ao--{#ag-bo, m0`k!1
dw"o{`*'k!">'c>'o<1i/"h:"r3"a!` - r%"r3"
a!` +- r%"-
  #ad4 hw"h3"o{'py1mt"ix"2g3"~1 .,G }1
j~1c3"hw"e:"k!"o/"dz`i:"33 x-y "k: #4,
x-y .1: -#2, x+y "k: #18, x+y .1: -#24
e3`$1bz1d!ak|`ey1j|'|"n0"2h!1 .,G h$"d>"
l!`nz1mt"k*'$1 ?{#ad-ao----/  
{#ad-bo----#.p_4 {r9"bz1h$"kt`qu'i/"o
  #ae4 i!"py1mt"e."c." "u<$33`o} rv" 
"v<$33`o} r/"e.'b$1a:12j+` "u<$33`o}+
"v<$33`o} .k (4, -7)_4 g3" "u<$33`o} d!a
bx1d/"$1 #6, h!1 "v<$33`o} d!abx1d/"$1
>{#ae-ao---- {#ae-bo----}_4 
{r9"bz1h$"kt`ku'i:"o
  #af4 i!"qx'au" 
  ,A .k `,(#3  #2`,)
        `,(-#2 x`,),
  ,B .k `,(#3 -#2`,)
        `,(#2 x`,),
  j*1a&' x $1i:1i/"- *`a:' ,A d!aqv`qx'
au"j)"r%`i:" ,B d!a c o0"2h!1i/"d$"
(x, c) .k ({#af-ao----, ?{#af-bo----/
{#af-co---- {#af-do----#)_4
{r9"bz1h$"kt`qu'i/"o
  #ag4 ku'k|"k3"j|"d!aky't"2;;e{`my1 o>`
ev`qx"hw"ot"c*"ix'dt"m01dw"h(`ev`d!ak*'
c|"i:" ?1/5#, qx"hw"k&'b!'ix"m01dw"h(`
ev`d!ak*'c|"i:" ?1/4#, ix"e81o>`ev`qx"
hw"k{"i:"m01dw"h(`ev`d!ak*'c|"i:"
?1/3#_4 k?'ft'h%`ix"f>'dw"ev`b/'mu12
et'j|"ot"c*"ix'dt"mw`c!ah%`jv'2gv1r("h3"
k&'b!'j|"ix"e812qx"e81h(`b/'e{"mu1i:12
q>'et"ev`o/"kt"c!ad!ak*'c|"i:"
?{#ag-ao----/{#ag-bo----#_4 
{r9"bz1h$"kt`qu'i/"o
  
    d*":"o/"qu",r="r!1f*1{av" #15 qu'o
  i3'my133ou`o/"qu"k&"s` #1 f*1h/`2m0`*'
h:`f*1p0"qu'o{'|1f*1m<"- et"hw"o{'i:"f*1
r%"h3"d>1j|'n0"h3"d>1- q0'e~`h!1f*1jy`s1
h3`:1s"rz1i:"i/'e+`2o*"e|'e+`b/'k*"e}"
k3"bz1r3"c*`s12q(`h!1k.'a31|`l("qu'-
  &d*" #ah a:" #ai f*1$1f*1h/`y
  m(`k31k*"q/1i:"p?`pw1k*"r9"hw" ,A, ,B,
,C, ,D, ,E, ,F cs"k!"bz1i:"i!"c*"mu1i:"-
bz1c*"a:'b/'2a=`o0"hw"cs"k!"bz1i:"k&"i!"
c*" #15 kt'qu'dt"2m0`k!"bz1i:"a:"i%`s`
c.`k)'qu'dt";$"i:`k!"k)'qu'dt"a:'kt'nz1
k("e4"e/"d{"r3"2{'js1hw"&o/"f&1bz1i:"
a&'y2gu"*"c.`k)'qu'dt"a:'kt'o*"e|'i!"a:"
*'f{1l7"d*"c/"et";f&1bz1i:"d!aqu'dt"a:'
kt'h!1o/"e|'i!"a:"l7"d*"c/"et"- k)`i!"
b/'j*1k$'r9" #15 kt'qu'dt"d!aqu'o/"g/1
e)"o{`33
                       
 6333333333336333363333633332
 l bz1i:"    l ,A l ,B l ,C l
 r33333333333r3333r3333r3333l
 l qu'dt"i/" l #3 l #3 l #2 l
 r33333333333r3333r3333r3333l 
 l bz1i:"    l ,D l ,E l ,F l
 r33333333333r3333r3333r3333l 
 l qu'dt"i/" l #2 l #2 l #3 l
 h33333333333h3333h3333h3333b

  #ah4 i:"=" ,A bz1i:"a&'m0`k)'qu'dt"e|'
{"k*`f{1l7"d*"c/"et"o {dv'e~`f*12 
#3 qu'o
  (1) #6 (2) #9 (3) #12 (4) #24 (5) #36
  #ai4 ?'+"k*'c.1r%`2h&`k&'e:'d>`e}"av`
dt"2oy"k*"r9"hw"cs"k!"bz1i:"k&"i!"c*"
#21 kt'qu'dt"2m0`k!"bz1i:"a:"i%`s`ev'k)'
qu'dt";i:"="h$"i%`e|'{"k*`f{1l7"d*"c/"
et"o {q0'e~`h!1f*12 #12 qu'o

    jv'l%`k&'i:"k*1l!`nz16"d%"d!ai/"a:1
  #a4 i(`e."$1 a, k&'b>'$1 d d!adz`b>'
i/"c+"jt1 n e."a:'r!1$1 
,S .k ?n(2a+(n-1)d)/2#
  i(`e."$1 a, k&'o*`$1 r (r /.k #1) d!a
dz`o*`i/"c+"jt1 n e."a:'r!1$1 
,S .k ?a(1-r~n)/1-r#
  #b4 $t ,A,B,C d!aaz"et1dy"c*`33
?a/sin ,A# .k ?b/sin ,B# .k ?c/sin ,C#
.k #2,R (,R $1 $t ,A,B,C 7"k+'~1ov"ky")
  $t ,A,B,C d!a|1et1dy"c*`33 
c~2 .k a~2"+b~2"-2abcos ,C
  #c4 *'$1i/"k|" ,X_3 x1, x2, """, x;n,
  e}"i/"py1k4'i/" .m;,X .k
?1/n#(x1+x2+"""+x;n)
  o{'a=`b>' .s;,X .k
>?1/n#`((x1-.m;,X)~2"+(x2-.m;,X)~2"+"""+
(x;n"-.m;,X)~2`)} .k 
>?1/n#`((x1~2"+x2~2"+"""+x;n~2)-
n.m;,X~2`)}
  #d4 :"$1i/"k|" (,X, ,Y)_3
(x1, y1), (x2, y2), """, (x;n, y;n), 
  e.'k}'e*"i/" r;,X, ,Y" .k
?(x1-.m;,X)(y1-.m;,Y)+
(x2-.m;,X)(y2-.m;,Y)+"""+
(x;n"-.m;,X)(y;n"-.m;,Y)/
n.s;,X".s;,Y#
  r$1k$'a:1et"{h$"i:"r!1a:1et"o qx'bz1
i:" y-.m;,Y .k 
r;,X, ,Y"?.s;,Y/.s;,X#(x-.m;,X)
  #e4 jv'l%`i/"a:133 >2} `:`: #1.414, 
>3} `:`: #1.732, >5} `:`: #2.236, 
>6} `:`: #2.449, .p `:`: #3.142
  #f4 d$"i/"a:133 log #2 `:`: #0.3010, 
log #3 `:`: #0.4771, log #5 `:`:
#0.6990, log #7 `:`: #0.8451
          33333333333333333333