Mathematics
Junior High
่ณๆฅใงใ๐ฆ
ใฉใกใใใ ใใงใใใใฎใงใ้กใใใพใ๐๐ปโโ๏ธ
ไบบ็ผ2ใซICOACOUEeC KUMใณใฐใใ
ใง็ตใฐใใ 4 ็น AB, CD ใใใ, AC KS
ใจ BD ใฎไบค็นใใจใใพใใ AD=CD KN
ใฎใจใ. ๆฌกใฎๅใใซ็ญใใชใใใ ๅคฎๆฌ ใฏใคSN
(1) ZACD=ใฎ* ใจใใใจใ, ABC ใฎๅคง 4
ใใใg ใ็จใใฆ่กจใใชใใใ
(2) BE=12 cm, ED=3 cm ใฎ ใจ ใ, CD
ใฎ้ทใใๆฑใใชใใใ
ๅใง.็นOใฏ AB ใฎไธญ็นใงใใ2็น
P.QใฏABไธใซใใ, AQใจOP ใจ ใ
ใฎไบค็นใ R ใจใใใจ. POBใ100* ใซใผใ B
ใPRQใ85* ใงใใ PQ ใจ QB ใฎ้ทใ
ใฎๆฏใ. ใใฃใจใ็ฐกๅใชๅๆฐใฎๆฏใง่กจใใชใใ<
> ้ๅ ใฎๅณใฏใ ็ทๅ AB ใ็ดๅพใจใใๅ P
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