Mathematics
Junior High
่ณๆฅใงใ๐
ใฉใใไธๅใ ใใงใใใใฎใงใ้กใใใพใ๐๐ปโโ๏ธ
ๆธใ่พผใฟใฏๆฐใซใชใใงใใ ใใใใ
ll ๅๅฝขใฎ้ข็ญ
ABCD ใง.
่พบ AD ใฎไธญ็นใ
ใจใ. ๅฏพ่ง็ท AC
ใจ็ทๅ BE ใจใฎไบค ใ
็นใF ใจใใพใใๅ่งๅฝขEFCD ใฎ้ข็ฉใ
50 cm' ใฎใจใ, AFBC ใฎ้ข็ฉใๆฑใใชใใใ
ๅ gomogascp<ใ ใไบใฉใผ)
E ใฏ่พบ BC ไธใฎ็นใงใ
BE=2EC ใงใใFใฏAE
ใจDB ใฎไบค็นใง
AE1DB. Gใฏ็ด็ทAE "ใงpg
ใจ็ด็ท DC ใฎไบค็นใงใใ
(1) AAGDoAEAB ใงใ
ใใใจใ่จผๆใใชใใใ
(2) AD=15 cm, BF็8 cm.EFใ6 cm ใฎใจ
ใธAGD ใฎ้ข็ฉใๆฑใใชใใใ
/ ใฎๅณใฎAABCใง.
็นDใฏ่พบABใฎไธญ
็น็นEEใฏ่พบACใ
2 :1ใซๅใใ็นใงใ
ใใ, DCใจBE ใจ
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