CRYING DOLPHIN
12.5뤱25/2ǤʤΤ͡

ߤܤͳѷꡢгѤ¤180()
ABAD5cmξꡢADCA濴˻ײ˲ž
ADABפ褦ˤȡͳѷABCDϢAECѷǤ롣
BEC23ʬ롣ޤAEC˸ƿAH򲼤ȡ
EHCHꡢEBBHHC415Ȥʤ롣()
ABHѤϡߤ(30-75-75)ѷѤȾʬꡢ
52.52225/8cm^2
ꡢABEᢤACDѤϢABHѤ4ܤꡢ25/8425/2cm^2

ʬϸ̩ˤϿؤǤ򤦤ޤˡϡġ
ï⤤ʤԳϡ 212ڡ 0:24:03 HomePage:֥⤢42906
deu
פ֤˥ꥢ륿ǻäǤޤ
#42906 ȤۤȤƱǤ
ϡ濴ȷǤդлǤ롤ȤȤʤΤʡ
212ڡ 0:27:47 42907
⡼ޥ
äȵդޤ^^;
ߤʤƱǤİ֤ Orz...
΢ž顢2դACջѷ
Aդߤȡ
ĺ305ջѷ((1))=5*(5/2)*(1/2)=25/4
ACDդ(2)ʤΤǡ(25/4)*2=25/2

...߼ѤȤäƹͤƤ^^;
¨ ^^;v 212ڡ 0:41:32 42908
Mr.ǥ
ȤꤢABCؤο򲼤AHȤ
ACDADAB˽Ťʤ褦˲žȤ

ѴؿĤä
ABH=(1/2)*5sin75*5cos75
=(25/4)*sin15025/8
ACD=AC'D=ACH*425/2

ȵ᤿塢ϰϤǹͤȤ
#42906ȤޤäƱ׻Ȥʤޤ
-----------------------------
Ԣ΢ABH=25/8ˤĤƤϡ̤ǻϰϤǤϡ
BH˴ؤAоΤA'ȤA'ľAB˲
A'H'ȤȢA'BH'=30
A'H'=BA'/2=5/2
ABH=ABA'/2=(1/2)*5*(5/2)225/8
212ڡ 0:58:58 42909
ǯ
ǤϤʤʤäĤ᤺ѴؿȤäƤޤޤ
ǤβϤ줫Ǥ
212ڡ 1:43:33 42910
ǯ
ǡ20ǯܤޤ͡ʤ䤬äΤϣǯۤǤˡ
19ǯ1996ǯ212裱Ǥ֤ĹȡǤϤʤǤ礦
ȰġĿŪʤȤǤۤ1ǯ1ǯ̤ʤ򤤤Ƥơ佪λޤ
ȤϸäƤ⡢1ǯˡ02䤯餤ϲ򤱤ʤΤäơηǼĤؤν񤭹ߤ򻲹ͤˤĺޤ
¾ˤ⡢1ǯ˿ϲⵤŤʤäΤޤ⤦Ʊĩ路Ƥ⡢򤱤뤫ɤϼޤ¿ʬƱȤǤ礦
MSɤǺƤΤǡʸˡ򤯤ⲿܤ֤ޤ
Ǥ⡢򤫤ä
äȤä³ߤ

212ڡ 2:06:32 42911
.
919ʵޤ
212ڡ 1:04:05 42912
٥륯åĥ
ǽΤޤФƤޤǤ͡
ACBACD˵ŤСACޤ֤ȻѷABCĺ30٤ջѷˤʤꡢѤϤ2ܤʤΤ12.5ˤʤޤ
212ڡ 1:07:24 42913
٥륯åĥ
ʤߤ˵ǯ210ϻ䤬򶵤Ƥä⤦ǯˤʤޤΤȤоޡ
212ڡ 1:11:42 42914
Ȥ
75٤cos,sinͤ;ǤǤ
ȤäƤΤǤ褯ͤΤäƤ뤬
75٤cos,sin(cos(75*%pi/180),sin(75*%pi/180)) xmaxima ǵƤ

rhs(part(solve(trigsimp(trigexpand(cos(2*a)))=cos(150*%pi/180),cos(a)),2))$
load(sqdnst)$
sqrtdenest(%th(2))$
rat(factor(%)),algebraic$
rootscontract(%)$
sqrt(factor(1-%^2))$
sqrtdenest(%)$
rat(%),algebraic$
%th(4);rootscontract(%th(2));
(sqrt(6)-sqrt(2))/4,(sqrt(6)+sqrt(2))/4

BC=3*a,CD=2*aȤAC̤;
5^2+(3*a)^2-2*5*3*a*cos(75*%pi/180)=5^2+(2*a)^2-2*5*2*a*cos(105*%pi/180)ṉ̃ߤǹͤ
(3*a)^2-2*5*3*a*cos(75*%pi/180)=(2*a)^2+2*5*2*a*cos(75*%pi/180)
4*a^2-40*a*cos(75*%pi/180)=0Ͽȼ׻ξǤäƤߤޤ

xmaxima
e1:4*a^2-40*a*(sqrt(6)-sqrt(2))/4=0$
e2:5*2*a*(sqrt(6)+sqrt(2))/8=x$
rhs(part(part(solve([e1,e2],[a,x]),2),2));25/2()

׻
4*a*(a-10*cos(75*%pi/180)) ͤ
4*a*(a-5*(sqrt(6)-sqrt(2))/2)=0 ꡡa=5*(sqrt(6)-sqrt(2))/2
ADC=AD(=5)*CD(=2*a=5*(sqrt(6)-sqrt(2)))*sin(75*%pi/180)/2 ͤ
ADC=5^2*(sqrt(6)-sqrt(2))*(sqrt(6)+sqrt(2))/8=25/2()
˭ԡ 212ڡ 2:05:36 42915
baLLjugglermoka
߼ѤȤäƤޤޤäʿ̿޷ϿزˡȤʤ()

D=105٤ʤΤǡBCˢBAE=30ȤʤEȤС2ABE=ACDʤΤ52.5=12.5#42913ǤϳACBACDϱ߼ѤȤ鷺ˤɤäƳФ褤.....

ˡϤ줫ͤޤ
212ڡ 1:45:03 42916
4329ܤβ
BC=3xCD=2xȤȡ;
AC^2=AB^2+BC~2-2ABBCcos75=25+9x^2-30xcos75
AC^2=AD^2+CD^2-2ADCDcos105=25+4x^2+20xcos75
ä25+9x^2-30xcos75=25+4x^2-20xcos75ʤΤx=10cos75
äƭADC=ADDCsin75/2=520cos75sin75/2=(510/2)2sin75cos75=25sin150=25/2
ȻѴؿȤ⹻ǽμդ˻ȤäƲ򤤤Ǥ褫äΤ
212ڡ 2:17:31 42917
Livesر໻ô
ѷADCҤäڤơäȲ󤷤Ƥ⤦󤯤äĤȡ졧줬ơȤ5Ѥʿĺ30٤ջѷäơ52.522ǽλ
212ڡ 2:39:45 MAIL:e.livezemi@gmail.com 42918
ǯ
#42916
ߤ濴Ϥȣ¡áĤ֤ȣĤջѷǤơϣäޤƣġΤϣ¤ȭϣĤϹƱʤΤǣѤǤ롣
ã¤ȭãĤѤ¤줾죱٤Ȥط顢ܣã¡ܣãĤޤ
212ڡ 3:29:31 42919
ϥ饮㡼ƥ
Ϥ褦ޤ߼ʤΤDưΤ
Ǥ
դڤߤǤ
212ڡ 7:10:49 42920

ְäƢABC (75/4) äƤޤ
ơ (125/4) äƤޤ

Ȥۤ
ꤴؤDz򤭤ޤ
3k, 2kȤ;ʤɡorz
212ڡ 8:54:45 HomePage:42921

ʤͳѷδְ㤤 m(_)m
212ڡ 11:42:04 HomePage:42922
ޥ
ꡢŬˡʤߤޤ10ʬ餤ǺäΤǤͥäơۤϴñʤǤ..äƺäơ٤ˤܤäƤʤޤñ㤹̲򤬤äȤˤΤǡåϾŤˤޤ

Ȥ櫓ǡɤ黻ϤƤǤ礦ɣǯä褦Ǥ줫ꤤޤm(__)m
iMac 212ڡ 12:01:31 HomePage:ARENA42923
uchinyan
Ϥˤϡơϡ
ࡤ񤷤ϤʤȻפޤߤ޷ϤɤޤǤ褯ʬʤΤǺΡ
ʴǡ

AC EC = 5 cm = AD = AB Ȥʤ E ޤ
ȡCE = ADEA = DCEA = DCꡤADC CEAǡ
ˡAB = EC ȱߤо ABCE ˤʤޤ
ǡA EC ʿԤ BC Ȥθ F Ȥ
AFCE ʿԻշAE = FCEC = AFCEA AFCABF AB = AF ջѷǤ
ǡBCFC = BCAE = BCCD = 32 ʤΤǡBFFC = 12 ޤ
ǡABF ǡABF = AFB = 75롤BAF = 30롤AB = AF = 5 cmꡤ
ABF = 5 * (5 * 1/2) * 1/2 = 25/4 cm^2
ADC = CEA = AFC = ABF * 2 = 25/4 * 2 = 25/2 cm^2
ˤʤޤ

AB = ADAB = AD߼Ѱ ACB = ACDADC AC ˴ؤޤ֤
㴳ڤʤΤǤȤϸʤǤ͡
ͥνȡ 212ڡ 12:36:03 MAIL:uchi@sco.bekkoame.ne.jp 42924

äȡBC:CD=3:2BC:CD=3:2ɤǤơ٤äƤ롼ȤˤʤäƤޤ褦ȤƤȤǤäդȵĤޤ
ABCοE,Bȿ¦BE=EFȤʤȤꡢAF֡CDαĹAGȤ롣
ľѻѷιƱꡢABEᢤAFEᢤADGäơAFCᢤADC
BC:CD=3:2ꡢCD=BFȤʤꢤADC=ABF
ABFĺ30롢դλѷʤΤǡBAF˿BHBH=äƢABF=AF*BH=ᣲ
äƢACD=25/2ȤʤޤϰϤǤ礦?
212ڡ 13:20:21 42925

ABC=ΤȤADC=ȤäΤǤϻϰϤʤΤǤ礦?
ޥ뤵󡢣ǯܤǤǤȤޤʤĤ⤢꤬Ȥޤʡˡ餿ƤΰǤ줫񤷤ꤪꤤޤ
212ڡ 13:27:01 42926
٥륯åĥ
䤢ᤤ
߼濴Ⱦ¤ջѷǤޤ͡ꡢȤȿؤˤʤäƤޤޤʬǹͤǤOKȻפޤ
212ڡ 14:23:28 42927

٥륯åĥ󡢤꤬Ȥޤ
˥󥸡Ȥʾ廻(ؤΤʤΤ礭˲򤳤ȻפΤǤԤ餤Ǥ
212ڡ 14:29:27 42928
٥륯åĥ
̤˿ؤǤʤǤȤäƤȻפޤä黻Dz򤭤ΤǤ͡
ʿȤäƤޤäȤޤ
212ڡ 14:33:05 42929

Ǥ⡩Фʤ餴ʤ
ģäžƢ£äˤäĤȡǤ롣
Ѥ75롢75롢105롢105뤳ΤȤ졧23
ǤĹջѷǤ(ĺ30)
εӤĹ5cmǾȲ椫顢ջѷ2դ
Ĺ15cm
ջѷѤĺѤ30顢1515/21/2225/4Ǥ롣
ջѷ椫95
äѤ
225/45/9125/4
졧23
Ѥ
125/42/525/2
ʴǤ
212ڡ 15:09:38 HomePage:42930

ν˺
ģäžơ¤ˤäĤջѷˤʤΤǡ
äϢܣ£ãĤʬǤ롣
212ڡ 15:18:41 HomePage:42931
uchinyan
(ν񤭹ߤͻҤ򸫤ƾޤ)

ǼĤɤߤޤϤꡤ󻻿ȿؤζ֤ʡ
ޤ̤˻ǤϤʤΤǡŬǤȤϻפޤ (^^;

#42906#42907#42908#42909θȾ#42931
ߤܤͳѷ ABC + ADC = 180Ȥ
ADC A 濴˲ž AD AB Ťͻѷäƹͤˡ
ABC + ADC = 180򼨤Ȥ̯ǡؿؤζ֤Τ褦ʵޤ

#42913
AB = ADAB = ADACB = ACDADC AC ˴ؤޤ֤Ȥˡ
ACB = ACD 򼨤Ȥ̯ǡؿؤζ֤Τ褦ʵޤ

#42916
ߤܤͳѷ ABC + ADC = 180ȤABE = 30Ȥʤ E BC ˼äƹͤˡ
ABC + ADC = 180򼨤Ȥ̯ǡؿؤζ֤Τ褦ʵޤ

#42918#42924#42930
AC EC = 5 cm = AD = AB Ȥʤ E ȡABCE ˤʤ뤳ȤȤˡ
ABCE ˤʤ뤳Ȥ򼨤Ȥ̯ǡؿؤζ֤Τ褦ʵޤ

#42919
ߤ濴 O ȤO ABCD ӡ٤δطĴ٤ ACB = ACD Ƴ
#42913Τ褦˹ͤˡ
߼Ѱ̾盧Τ褦ʴǾǤΤǡ
򻻿ȤƼȴˤäȤȤǤ礦

#42920
߼ʤΤDưΤ Ǥ
Ȥˡܺ٤

#42925#42926
A BC ˿򲼤 EB ȿ¦ BE = EF Ȥʤ F Ȥꡤ
CD αĹ A 򲼤 G Ȥƹͤˡ
ǡľѻѷιƱꡤABE AFE ADGƳƤޤ
¿ʬǡߤܤͳѷȤäƤ褦Ǥ
餬̯ǡؿؤζ֤Τ褦ʵޤ

#42909Ⱦ#42910#42915#42917#42921
⹻ءѴؿˤˡ

ʤ
#42927
ꡢȤȿؤˤʤäƤޤޤʬǹͤǤOKȻפޤ
ϤäȤäǤ͡ǧȶüòǤ⤢ˤʤ뤫Ǥ (^^;
ͥνȡ 213ʶ 11:43:02 42932

ν˺
ģäžơ¤ˤäĤջѷˤʤΤǡ
äϢܣ£ãĤʬǤ롣
212ڡ 21:12:51 HomePage:42933

ޤɲƤޤޤm(_)m
212ڡ 21:15:06 HomePage:42934
٥륯åĥ
߼ѤϻȤäƤޤհλѷѤȹ⤵椬ȤѤޤ
޷ʤΤʬ䤹Τ񤷤
213ʶ 1:17:41 42935
٥륯åĥ
ʤߤ105٤ˤĤƤջѷѤƹͤޤ
⤵椬23ˤʤΤľѻѷѡ
ޤ5դˤѤ23ȵᡢACդˤľѻѷͤƢACB = ACDʬޤ
213ʶ 1:27:07 42936

ѴؿѤƤޤޤɤǤ
213ʶ 20:45:24 42939
٥륯åĥ
ȤƤƻDz򤤤ĤǤؤμǷ̤ΤäƤ֤Dz򤤤Ƥʾ塢˻Dz򤤤ȤϤʤΤޤ͡
ޤ⤽⻻ȿؤΤʶǤʤΤǡμ­Ǥ
uchinyanʬϤϤĤڤߤˤƤޤΤǡޤꤤޤ
214ڡ 3:25:13 42940
Ϸʼ
£ä˿ŤȤ
£ŤȤޤ֤ѷΣǤ
򢤣ģƤȤ
ߣࣲࣲ᣶
ãĤȿײ˲ž
ãĤģƤΣܤȤ狼
ߣᣱ
ʡ 214ڡ 10:30:14 42941

ȥ
Υס 214ڡ 20:33:30 HomePage:浮ȣ42943
ys
ޥ뤵ֹ椬轵ƱֹߤǤ衢^ ^
214ڡ 21:50:42 42944
ʪ
ʤꤪޤ19ǯǤȤޤ
75٤λѷ105٤λѷ2ĤĤäĤ150١5cmջѷĤäƹͤޤ
ȡ919Ǥ͡
ܡ 215 20:18:25 42945
ʪ
ϡAtsushi Suzukiν(1996.02.15 am2:34)19ǯΤ褦Ǥ
ȡ915󤫤ν̤ФƤޤ
ܡ 215 20:28:27 42946
ޤ
# 19ǯǤȤޤ䡡ޥ뤵

գ£áգãġᣳ ̣£ạ́ãġᣳ
㤤³Ƥޤġޡ ֤ä㤤ޤ^^ ᤤ

ǧȤǡǤβˡϤޤäפĤ
ǥꥴäƤޤޤ orz

216ʷ 13:13:05 42947
maple
ǤĤĤäƤޤäġ
;ĹФа֡ġġġ
216ʷ 18:01:35 42948
maple
ǤĤĤäƤޤäġ
;ĹФа֡ġġġ
216ʷ 18:02:16 42949
maple
졩󲡤
216ʷ 18:02:41 42950
ʪ
ɤ򲡤Ʊ᤬⤦Ƥ褦Ǥ
äȤäƤߤޤ
ܡ 217ʲС 18:34:06 42953
٥륯åĥ
ջѷĺѤ30ٸäѤȾʬ15ޤ͡
15ٸä7.5١
219ڡ 0:11:37 42954
4329ܤβ
ABCľջѷȹͤƤȤꤢФȤܶʤǤˤä
θBAC=xȤƵx˴ؤ餺7.5ˤʤΤǧ
219ڡ 0:15:01 42955