Mathematics
Junior High
ใๆฐๅญฆ ไธญ3 ๐โ๐ป ๅๅจ่งใฎๅฎ็ ใ
๐กใฌใใผใใไฝๆใใชใใใฐใใใชใ็บใใใใซไผผใใใใ็ฐกๅใช้ก้กใไฝใใใใฎใงใใใๆฐๅญฆใ่ฆๆใใใฆใฉใ่ใใใ่ฏใใๅใใใพใใ๐ฆ
ใใใใใ้กใใใพใm(_ _)m
ๅณใฎใใใซใๅ0ใฎๅๅจไธใซ4็น A, B,C, Dใใใใ็นBใ้ใ,AD ใซๅนณ่กใช็ด็ทใจๅผฆCDใจใฎไบค็น
ใEใจใใใจใ,ๆฌกใฎๅใใซ็ญใใชใใใ(1)1 ็นร5, (2)3 ็น)
(1)็ฉบ็ฝใๅใใโณABCใฎADEB ใงใใใใจใ่จผๆใใชใใใ
โณABCใจโณDEBใซใใใฆ,
B
ๅผง BC ใซๅฏพใใๅๅจ่งใฏ็ญใใใใ
EDB
LBAC=LCใข)
ใฎ
| 3ๅผง AB ใซๅฏพใใๅๅจ่งใฏ็ญใใใใ
APB
| LACB=L(ยฐใค)
E
AD//BE ใใ, ๅนณ่ก็ทใฎ(ใฆใฏ็ญใใใใ,
ADB
PBEใ
ใใจใ)ใ=(_ใจ)71
ใฎ
DBE
2, 3ใใ, LACB=( ใจ)
ใฎ, Oใใ,
1ใใ
*2็ตใฎ่งzใใๅฝใใ
โณABCใฎADEB
Jๅฑฑ
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