٥륯åĥ
ADC⤦ѰդƤȤBADB򤯤äĤơˤAD΢֤ADC򤯤äĤ2+2160ʤΤǥ2060Ȥʤޤ
ǽְä20Ƥޤޤ
413ڡ 0:19:03 52375
⡼ޥ
ˡCD=CEջѷȡ
Cγ=2*+2*
so...C=
ΤȤAB=AC
ĤޤꡢCD=CA DAϰ
so...C=
so...ջѷ
so...C=180-2*80=20=
so...2*=180-3*20=120
so...=60
413ڡ 0:29:24 52376
⡼ޥ
ä...^^;
BCD=
ΤȤAB=CD
so...ADȤ
ǤǤ ^^
413ڡ 0:32:34 52377
̻
ACBE=ABȤʤEȤ롣BAEϣջѷǡ
32ᥢ2(ܥ)180ꡢBEAᥢܥ
ADEᥢܥʤΤǡADE⣲ջѷ
ADAEäơABDᢤACE
ꢤCAD⣲ջѷȤ狼ꡢܥ80
20, 60
413ڡ 0:46:05 52378
鯤ο
ABDDCβ¦ˡBADCŽ碌ޤ
ΤȤDΰưEȤޤ
ADαĹȡCEαĹθFȤޤ

λߥܣߥᣱꡢ
FDEFEDᥢܥˤʤޤDFEᥢ
äơFDEջѷǡFD=FE

DA=EC顢
FA=FD+DA=FE+EC=FCȤʤꡢ
FACջѷ

äơ180-80*220
äơ60
//
413ڡ 0:48:40 52379
ֿء׾ι
C=ʬޤ
413ڡ 2:37:42 52380
ɥȥ
ä̲äΤǥꥢ륿ǰ
Τǧ顢ޤ˴봶
https://sansu-seijin.jp/sansu-orympic/2412/
̲ƥꥢ륿षȤФ褫äʤ
413ڡ 6:40:43 52381
ֿء׾ι
ޤФƤʤ褦ʤΤǡȤˡ񤭤ޤ
ABDˤơAD=AB/sinBDA*sin
ADCˤơAD=DC/sin80*sinC
AB=DC顢2sin80*sinsinBDA*sinC
BDA=180--顢sinBDA=sin(+)ǡ
C=100-(+)Ǥ
¤θˤꡢ=cos(80-)-cos(80+)
=cos{2(+)-100}-cos100
ǡ3+2=1802(+)-100=80-Ǥ
äơcos(80+)=cos100
٤ϰϤͤȡ80+=100Ǥꡢ=20뤬狼ޤ
äơ=60ˤʤޤ
413ڡ 7:25:09 52385
ֿء׾ι
޷ιͤǤҤȤġ
BCŤBA=BEȤʤ褦˼ޤ
ABEջѷǡ3+2=180뤫顢DAE=Ǥ
äơޤAED=ADE=+ȤʤꡢAD=AEˤʤäƤޤ
Až濴ȤơADC򥢤žADAE˽Ťʤ褦ˤȤ
CΰưFȤޤȡABEFʿԤƱĹȤߤΤ
ͳѷABEFʿԻշˤʤäƤ뤳Ȥ狼ޤ
äơC=F=B=狼ޤ
413ڡ 7:55:03 52386
Ȥ
=a,=bȤ3*a+2*b=%pi
bˤĤƲ򤯤
b=%pi/2-3*a/2(1)
%pi-a-b
%pi/2+a/2
ɸD(0,0),A(1,0)
ľDB:y=-x/tan(a/2)
ľAB:y=-(x-1)/tan(3*a/2)
a/2=A(2)Ȥ
ľDB:y=-x/tan(A)
ľAB:y=-(1-3*tan(A)^2)*(x-1)/(3*tan(A)-tan(A)^3)
ľCD:y=tan(b)*(x-1)
ľDB,ABθ
Bxɸ:(3*tan(A)^2-1)/(2*tan(A)^2+2)
Byɸ:-(3*tan(A)^2-1)/(2*tan(A)^3+2*tan(A))
ޤľDB,CAθ
Cxɸ:(tan(A)*tan(b))/(tan(A)*tan(b)+1)
Cxɸ:-tan(b)/(tan(A)*tan(b)+1)
BD^2-CD^2=0
((3*tan(A)^2-1)/(2*tan(A)^2+2)-1)^2
+(-(3*tan(A)^2-1)/(2*tan(A)^3+2*tan(A)))^2
-((tan(A)*tan(b))/(tan(A)*tan(b)+1))^2
-(-tan(b)/(tan(A)*tan(b)+1))^2=0 ѷ
-(tan(A)^2+1)*(tan(A)*tan(b)-1)
*(3*tan(A)*tan(b)+1)
/tan(A)^2/(tan(A)*tan(b)+1)^2/4=0
tan(A)ˤĤƲ򤯤
tan(A)=1/tan(b)b=80٤A=10
(2)Ȥa=20
(1)
b=180/2-3*20/2=60١()
˭ԡ 413ڡ 17:41:30 MAIL:fttnm528@ybb.ne.jp 52387
ǯ
ǽ
ADCҤä֤ƭABDˡADDAǤäĤơABCջѷ
ȤƵ᤿ΤǤǤABCB,D,CľǤ뤳ȤݤʤΤ̲...#52378ȤۤƱʤΤǤ...

xyȤƤ
ABC˿AH򲼤
DH=EHȤʤEBCC¦ˤȤ
AEDADEx+y
ABEѤ¡1803*x+2y=180ꡢ
DAEx
BAE=BEAʤΤǭABEջѷ
ABAEDCDHEH
BHCH
顢ABCջѷ
¨DCACʤΤǡCADջѷ
x+y80ʤΤǡCx1802*8020
Τˡy60
414ʶ 9:44:57 52388
KawadaT
AD΢֤ơADDAˤޤѷDCBϡĺDջѷǤ
ĺѤ礭ϡ+2*ǤꡢPꡢջѷDCBѤ礭ϥˤʤޤ
äơ΢֤CABʿѡC礭ϥˤʤޤ

ѷDACѤϥ+2*+80ʤΤǡ+2*=100٤Ȥʤꡢ+4**2=200٤ǤP饢=20١
60٤Ȥʤޤ
414ʶ 9:51:20 52389
0202
黲äǤ

ADҤä֤ȡͳѷABDCǤޤ
BCȳBAC礭ϥP˽ȳC⥢Ȥ狼ꡢѷABCջѷʬꡤDܥǡ80٤ʤΤǡ180808020٤ǡѥ20٤ʬꡤ802060٤ʬޤ
414ʶ 21:22:02 MAIL:kazuki0202@ymail.ne.jp 52390

ƱޤǥȥγѤͿ줿꤬ꡢδطΩľƱˡȤȻפäƱƲ򤭤ޤ
416 12:06:28 52391
ޥ
ϤޤǤդơĴʹĴҡˤΤۤϡ֡ޤm(_ _)m
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