้
ใใฆใใฟใพใใ๏ผ
ไธๅฟๆธใใฆใฟใพใใใใ้้ใฃใฆใใๅฏ่ฝๆงใใใใฎใงใๅ
็ใซ่ใใฎใไธ็ชใ ใจๆใใพใใ(ใใใใๅใฎ่ฒทใใ่จผๆใฏใในใใใใชใใใจๆใ)
Mathematics
Junior High
๐๐๐๐๐ปโโ๏ธ
4็ชใฎ1~3ใๅใใใพใใ๐จ๐ฆ
ๆใใฆใใ ใใ๐
ๅ็ญใจ่งฃ่ชฌใ่ผใใฆ้ ใใจๅนธใใงใ๐โโ๏ธ
็ญ
โ4 ๅณใฎๅณใฎใใใช1่พบ18cmใฎๆญฃๆนๅฝขABCDใใใใ็นQใฏ
ๅฏพ่ง็ทAC, BD ใฎไบค็นใงใใใ 2็นP, Qใฏใใใใ่พบBC,
CDไธใฎ็นใงใใ,BP=CQใงใใใใพใ,็นRใฏ็ด็ทPO
ใจ่พบDAใจใฎไบค็นใงใใใ
ใใฎใจใใๆฌกใฎๅๅใซ็ญใใใ
ODRใงใใใใจใ่จผๆใใใ
(1) OBP
(2) RPQใฎๅคงใใใฏไฝๅบฆใใๆฑใใใ
(3) PR=20cmใฎใจใ, QPCใฎ้ข็ฉใฏไฝcm2ใ,ๆฑใใใ
18cm
A
B
R
P
็ญ
Un
MN
Answers
โด
BP=DR
BDใACใฏๆญฃๆนๅฝขใฎๅฏพ่ง็ทใใ
BO=DO
่งPBO=่งRDO
ใง่จผๆใงใใใใจ
ๅฐใ๏ผ
ๅฐใใ ใๅพ
ใฃใฆใใ ใใ๏ฝฅ๏ฝฅ๏ฝฅ
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