ͣ.ǥ
ޤϡü첽ơ1/2*14*749ȤƽФƤơ
ʤˤƤ⡢󲿤ȤϤ䤵
920ڡ 0:14:16 39793

Ĺ7cmͿƤʤѥäȸ7^2=49cm^2äݤä顣ϻȤʤä
ϵ塡 920ڡ 0:37:08 39794
ͣ.ǥ
Կؤˤˡˤʤޤ
£ãǢᢤģ㚣ãǢ梤Уãѡ桡21
£ǡģš72ģŢݣ£
ä
ģ£ţǡ1/2*72*7249ʣ2ˡȤʤޤ

ɵ;嵭ˤơ£Ǥ1դУѤǤгĹ
äơ£*ģš£ǡ2ϡ7*72ܤȤʤ
ģ£ţǡ1/2*£*ģš1/2*7*7/249
ȤäƤСϰϤǤβˡǤϤʤǤ礦
920ڡ 1:36:34 39795
⡼ޥ
#39795 Mr.ǥǼ
錄...羮ɩηˤäĤü췿ǹͤޤ...^^;
(+)⤵/2=(줾г)(줾г/2)/2=14*7/2=49
...Orz...

but...ɤ...?
920ڡ 1:18:13 39796
դޤ
ξ޷̵ˤΤǡPQCѤɤȹͤޤξгȲȤ⤵7ȤʤΤǡǷ׻ޤ
920ڡ 1:21:47 39797
դޤ
ξ޷̵ˤΤǡPQCѤɤȹͤޤξгȲȤ⤵7ȤʤΤǡǷ׻ޤ
920ڡ 1:21:49 39798
դޤ
iPad2٥åפääơ2Ƥ㤤ޤͤޡɤ餫Ƥʤ
niigata 920ڡ 1:29:03 39799

ޤ
ΤϲʬλѷBCEϴطʤߤǤ͡
ƱABCDGCEF򲣤2¤٤ơߤˡ
ơ2ĤгȤȡջѷǤޤ
ȤȤPQ=7cmȤʤΤǡ
BCE14cm
1դ7cm(2ĤϹƱ)ʤΤǡ
Ѥ
147249
920ڡ 2:05:57 HomePage:39800
ma-mu-ta
BGDE֤ȡBCGᢤDCE ǡBGDEBGDE
DGBE򤽤줾RSȤȡ
PR//BG//SQPRSQ(1/2)BG
PS//DE//RQPSRQ(1/2)DE
ȡPRSQPSRQľ򤷡PRSQPSRQ 顢ͳѷPSQR
DPRܢESQ(1/4)DBG(1/4)EBG(1/4)ͳѷDBEG
BPSܢGRQ(1/4)BDE(1/4)GDE(1/4)ͳѷDBEG
DPRܢESQܢBPSܢGRQ2(1/4)ͳѷDBEG(1/2)ͳѷDBEG
PSQRͳѷDBEGݡʢDPRܢESQܢBPSܢGRQ
ͳѷDBEG(1/2)ͳѷDBEG(1/2)ͳѷDBEG
äơͳѷDBEGPSQR277(1/2)249
920ڡ 3:10:18 39801
HirotakaUEDA
ۤ#39800βˡĤƱǤȤƤޤʸΤɤˤƱǤȤ
񤫤Ƥޤ(^O^)
פƤޤABCDGCEFƱǤʤвˡʤȤˤʤޤ
920ڡ 4:14:04 39802
mukku
Ȥ夫Ǥää
920ڡ 5:23:39 39803
Ȥ
ɸ֤ޤ

ABCD,EFGCΰդ򤽤줾a,bޤDCG=Ȥ
ɸB(-a,0),C(0,0),D(0,a),P(-a/2,a/2)(1)
Ȥ
ľCE:y=-tan()*x
ľCG:y=x/tan()
ľCExɸcȤE(c,-tan()*c)
ľCEĹb
c^2*(1+tan()^2)=c^2*(cos()^2/cos()^2+sin()^2/cos()^2)
=c^2*(cos()^2+sin()^2)/cos()^2=c^2/cos()^2=b^2
衡c=b*cos()E(b*cos(),-b*sin())(2)
ޤľCGxɸdȤG(d,d/tan())
ľCGĹb
d^2*(1+1/tan()^2)=d^2/sin()=b^2 d=sin()*b
G(sin()*b,b*cos())
(2)Q
Q(b*(cos()+sin())/2,b*(cos()-sin())/2)
(1)εΥ7ʤΤ
(b*(cos()+sin())/2+a/2)^2+(b*(cos()-sin())/2-a/2)^2=49
b^2*(1+2*cos()*sin())/4+a*b*(cos()+sin())/2+a^2/4+b^2*(1-2*cos()*sin())/4-a*b*(cos()-sin())/2+a^2/4=49
a^2/2+b^2/2+a*b*sin()=49(3)
ǢBEGD=CGD+BEC+BCD+CEG=
a*Gxɸ/2+a*EyɸΡ/2+a^2/2+b^2/2=
a*b*sin()/2+a*b*sin()/2+a^2/2+b^2/2=a^2/2+b^2/2+a*b*sin()
(3)κդƱ颢BEGD=49()
˭ԡ 920ڡ 6:06:30 MAIL:fttnm528@ybb.ne.jp 39804
Ф
ma-mu-ta󡣿ؤФƤˤʤȤޤޤ͡
ΤMr.ǥƱؤȤäˡǤ
920ڡ 7:04:54 39805

hirotakaUEDAء
Ĥεϡͭ롡ȤΤߤǤ
ĤƱǤʤȤ⤢ޤ
򤯤ˡƱDz򤯤ΤϡǤϤޤ
920ڡ 8:23:22 MAIL:yasuhirovich@oboe.ocn.ne.jp 39806
̤ꤹ
ɸǤʤ顢ü첽C(0,0)B(a,b)E(c,d)Ȥ롣D(b,-a)G(-d,c)顢P{(b+a)/2,(b-a)/2}Q{(c-d)/2,(d+c)/2}
ǡPQ7顢
((d+c)/2-(b-a)/2)^2+((c-d)/2-(b+a)/2)^2=7^2 (d^2+2*a*d+c^2-2*b*c+b^2+a^2)/2=7^2
ޤDBEGECG+GCD+DCB+BCEȹͤơ
DBEG=(d^2+c^2)/2+(a*d-b*c)/2+(b^2+a^2)/2+(a*d-b*c)/2=(d^2+2*a*d+c^2-2*b*c+b^2+a^2)/2
ϢȰפ뤫顢
DBEG=7^2
920ڡ 9:19:44 39807
HirotakaUEDA
ͤء

Ǥ͡ǤĤƱǤȹƱǤϤʤξθڤɬפäȤȤǤ͡
920ڡ 9:39:16 39808
???
D֤ˤäƤƱäΤ϶ä
920ڡ 10:47:27 39809
ߤ
礭٤˴ؤƤξʤΤǡɤʾǤˤʤȿ¬
׻䤹֤ʤƲ򤭤ޤ
920ڡ 11:02:31 39810
abcba@baLLjugglermoka
Ʊʿ45뷹֤ͤ49ͽۤĤޤ
920ڡ 11:38:49 39811
abcba@baLLjugglermoka
ü첽ξϡĤг¤14ˤʤ褦¤٤УĤ礭ϹƱǤʤƤ׻Ǥޤ͡
920ڡ 12:04:48 39812
uchinyan
Ϥˤϡơϡ
Ū褯ѥʤΤǤǶᡤؤŤƤޤäƤ;Ƭ⤫ӻפ鷺Dz򤤤Ƥޤޤ
󤤤󡤤ȻפäơǾƤľäƿؤäݤȤʡȤˡǤ

B GD EP CQ C Ӥޤ
BC = DCGC = ECBCG = BCD + DCG = 90+ DCG = GCE + DCG = DCE ʤΤǡBCG DCEBG = DE Ǥ
ˡBCG DCE C 濴 90žִطˤޤǡBGDE Ǥ
ꡤDBEG = BG * DE * 1/2 = BG * BG * 1/2ˤʤޤ
ǡPBCCBDQCGECG Ϥ٤ľջѷꡤBCPC = GCQCBCGC = PCQC
ޤBCG = BCD + DCG = 90+ DCG = PCD + GCQ + DCG = PCQ ʤΤǡBCG PCQBGPQ = BCPC Ǥ
ǡCBDPCD = (BC * BC * 1/2)(PC * PC * 1/2) = (BC * BC)(PC * PC) = 21 Ǥ
ǡ
(BG * BG)(PQ * PQ) = (BC * BC)(PC * PC) = 21(BG * BG)(7 * 7) = 21BG * BG = 49 * 2Ȥʤꡤ
DBEG = BG * BG * 1/2 = 49 * 2 * 1/2 = 49 cm^2ˤʤޤ

¿ʬ 7 cm ѷ롤껻äݤˡʤȻפĤġ

ˤƤ⡤Ψ95פˤʤäƤޤʤˤϴñȤϻפʤΤɡ
ͥνȡ 920ڡ 12:19:11 39813
ͣ.ǥ
ü첽ˤĤơ(#39806,#39808 ʤɤ˴Ϣ)
ü첽ǤǤƤͤϡ򤬣ĤʤˤϡȰפޤˤäƤϾ櫓ɬפǡ
줾ξβ򤬰ۤʤ⤢ꤨޤ
Τߤ򼨤ˤͭ⤷ޤ󤬡ǤȤäƤ褤ǽ롣פˤȤɤޤΤǤ礦
920ڡ 12:24:01 39814
uchinyan
ǼĤɤߤޤ
Ψ˹⤤Τϡü첽ǧڡʤɤ뤫顤ΤʤǤ͡

#39793#39796#39797#39800#39803#39810#39811#39819
ü첽ˤˡ

#39794
ˤˡ

#39795Ρɵ͡#39813
BG = DEBGDEDBEG = BG * DE * 1/2 = BG * BG * 1/2 Ѥ
CBDPCD = 21 ʤɤ BG * BG = 49 * 2 ƳƲ򤯲ˡ

#39801
BG = DEBGDE ˡDGBE RS Ȥ PSQR ꡤ
DBEG = PSQR * 2 ƳƲ򤯲ˡ

#39821
CDG = CBE DBEG = ޳ѷCPBEQ * 2 ˤʤ뤳Ȥ顤
޳ѷCPBEQ Ȥ 180žΤ碌޷ 7 cm ѷƲ򤯲ˡ

#39795κǽ#39805
()ˤˡ

#39804#39807
(ɸ)ˤˡ
ͥνȡ 921ʶ 12:20:13 39815
ߡ
ﲼ(ߥޤǥΡڥ)ǤϡȤꤢ49äƤ
ƹͤ褦ˤ٤ȡġ

ʤʤäǤƤޤ󤬡轵ϻä10ʬ᤯ꡤޤǤ뤤ʡ
920ڡ 14:15:53 39816

ꥢ륿ǾĤʬˤʤǤͤü첽ΰǤ͡

ü첽ǰȯѥϵפ֤ʵ
920ڡ 21:11:43 39817
Ф
uchinyan
ͤĤʤơѤȤ衣ȸСǣߣߣࣲäƤߤǤ礦̡⤦Ĥ餤ܤޤͤɤäΤˤ͡
920ڡ 21:20:07 39818
粬ҹ
Ʊ礭ꤷջѷǵޤ
14*7/2=49
Ψͤ˹⤤Τ˶äޤ
920ڡ 21:33:12 39819
ʸ
ž̶ˤҤᤤ
920ڡ 21:38:25 39820
nobu
פ֤˽񤭹ߤޤ
ꥢ륿Ǥü첽Ʋ򤭤ޤäȹͤƤߤޤ

ѷCDGȻѷCBEѤΤ
ѷCPBEQΣܤѤ뤳Ȥˤʤޤ

οޤڤäƤΤޤޣٲžBEˡEBˤäĤ
߾4¤٤ޤ
ڤäPQ򿷤P,QȤȻͳѷP QPQդ7Ȥʤޤ
ѷCQPȹƱʻѷѷCQPޤ4о줷Ѥϡդ7Ȱפޤ
920ڡ 21:53:16 39821
uchinyan
#39821
ʤۤɡϻ餷ƤǤ͡
ͥνȡ 921ʶ 12:10:34 MAIL:uchi@sco.bekkoame.ne.jp 39822

轵ꡢ򤱤ޤǤ⡢ޤϤʤȣ򣳤ȣʬơľѻѷɤˤǤΤǤϤʤȤ㤴äƤ顢ɹƱʤ顦Ȥü첽ǡ
ͳѷȤľѥȤΤǤ礦󥰥Ȥ빽ʤΤĩ路Ƥߤޤ
921ʶ 19:57:49 39823
ϥ饮㡼ƥ
üʷͤޤüäǤ¤٤ƤƤΩäʤΤǡDCG
ˤޤ
921ʶ 20:39:46 HomePage:湩ؤ˥39824
Ƥݤ
رޤǴ(ʬ)칶ƤޤۤɡƱνƤäΤǤϤؤϳڤǤ͡
925ʲС 1:34:05 39825
fumio
Ϥ褦ޤפ֤֤ǤϤϤϡ
Ƥ⽪ä㤤ޤ͡Ǵĥޤ礦
926ʿ 5:47:23 39826