Mathematics
Junior High
๐๐๐๐๐ปโโ๏ธ
4็ชใฎ1ใป2ใป3ใๅใใใพใใ
ๆใใฆใใ ใใ๐โโ๏ธ
ๅ็ญใจ่งฃ่ชฌใๆธใใฆใใใใๅฉใใใพใ๐ฆ
14 ๅณใฎๅณใฎใใใชABACใฎไบ็ญ่พบไธ่งๅฝขABCใใใใ ็นDใฏ้ ็นB
ใใ่พบACใซๅผใใๅ็ทใจ่พบACใจใฎไบค็นใงใใ, ็นEใฏ้ ็นCใใ่พบ
ABใซๅผใใๅ็ทใจ่พบABใจใฎไบค็นใงใใใ ใพใ, 2็นF,Gใฏใใใใ
็ทๅBD, ่พบACใฎๅปถ้ทไธใฎ็นใงใใ, AD = FD, โ ABD=โ FGDใงใใใ
ใใฎใจใๆฌกใฎๅๅใใซ็ญใใใ
E
B
(1) โณABD = โณFGDใงใใใใจใ่จผๆใใใ
G
(2) โ A=38ยฐใฎใจใ, CBGใฎๅคงใใใฏไฝๅบฆใ, ๆฑใใใ
(3) AB=5cm, BD=3cm, DA=4cmใฎใจใ, EBGใฎ้ข็ฉใฏไฝcmยฒ ใ ๆฑใใใ
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