Mathematics
Junior High
๐๐๐๐๐ปโโ๏ธ
6๏ธโฃ ๏ผ1๏ผใ๏ผ3๏ผใๆใใฆใใ ใใ๐โโ๏ธ
่งฃ็ญใจ่งฃ่ชฌใ่ผใใฆ้ ใใใจๅฉใใใพใ๐ฆ๐๐๐ป
ๅฎใใใ้กใใใพใ(โแดอหฌแดอ)โจ๏ธ
ๅณ1
6 ๅณใฎๅณ1ใฎใใใชใไธ่งๆฑABC-DEFใฎๅฝขใใใๅฎนๅจใใใ,
AC=10cm, AD=6cm, ABC=90ยฐใงใใใใใฎๅฎนๅจใ,ๅฎนๅจใฎ
ๅบ้ขDEFใจ,ๅด้ขADFCใซๅ็ดใชๅนณ้ขใฎไปๅใBGHEใง,ๆฐดใใใ
ใชใใใใซ2ใคใซๅใ,ใใฎๅพ,่พบCFใใตใใๆนใซใๆฐด้ขใฎ้ซใ
ใๅบ้ขHEFใใ4cmใซใชใใพใงๆฐดใๅ
ฅใใใGB=4cm, AG>GC
ใงใใใจใใๆฌกใฎๅๅใซ็ญใใใใใ ใใๅฎนๅจใฏๆฐดๅนณใชๅบใฎไธใซ็ฝฎ
ใใใฆใใใๅฎนๅจใไปๅใใฎๅใใฏ่ใใชใใใฎใจใใใ
(1) ไธ่งๆฑABC-DEFใฎไฝ็ฉใฏไฝcmใ,ๆฑใใใ
(2) ๅฎนๅจใซๅ
ฅใฃใฆใใๆฐดใฎไฝ็ฉใฏไฝcmยฒใ, ๆฑใใใ
A
* Va+vx6+ (S+x) x (2)
I=U8-xF/
(3) ๅนณ้ขBGHEใฎไปๅใใๅใ, ๅณ1ใฎๅฎนๅจใซใตใใใคใใฆๅฏ้ใใใใจ, ๅณ2 ๅณ2
ใฎใใใซ, ่พบADใไธใซใใฆ, ้ขADFCใๅบใซๅฏพใใฆๅ็ดใซใชใใใใซๅฎนๅจใ
ๅพใใใ APใฏ,็นAใใใฎๆฐด้ขใฎ้ซใใ่กจใใฆใใใ ใใฎใจใ, APใฎ้ทใใฏ
ไฝcmใ, ๆฑใใใ
ke
1*** -o (8) P
A
Hi
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B
E
F
E
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