Mathematics
Junior High
๐๐๐๐๐ปโโ๏ธ
4็ชใฎ1~3ใๅใใใพใใ๐จ๐ฆ
ๆใใฆใใ ใใ๐
ๅ็ญใจ่งฃ่ชฌใ่ผใใฆ้ ใใใจๅฉใใใพใ๐โโ๏ธ
ๅณใฎๅณใฎใใใช1่พบ18cmใฎๆญฃๆนๅฝขABCDใใใใ ็นใฏ
14
ๅฏพ่ง็ทAC, BD ใฎไบค็นใงใใใ 2็นP,Qใฏใใใใ่พบBC,
CDไธใฎ็นใงใใ, BP=CQใงใใใ ใพใ, ็นRใฏ็ด็ทPO
ใจ่พบDAใจใฎไบค็นใงใใใ
ใใฎใจใๆฌกใฎๅๅใซ็ญใใใ
(1)โณOP=โ ODRใงใใใใจใ่จผๆใใใ
(2) RPQใฎๅคงใใใฏไฝๅบฆใ, ๆฑใใใ
(3) PR=20cmใฎใจใ,โณQPCใฎ้ข็ฉใฏไฝcm2ใ,ๆฑใใใ
18cm
B
R
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