ใ
่งฃ็ญใฎใฉใฎ้จๅใใใใใชใใๆใใฆใใใ ใใใจๅฉใใใพใ
Mathematics
Junior High
่ณๆฅใงใ๐โโ๏ธ
ไธญ3ๆฐๅญฆ,ๅผใซใใ่จผๆใงใใ
1ๆ็ฎใๅ้กใ2ๆ็ฎใๅ็ญใซใชใใพใใใใใใใ้กใใใพใ๐
ๅๅพrmใฎๅๅฝขใฎๅๅฐใฎๅจๅฒใซ, ๅน
amใฎ้ใใใใ ใใฎ้
ใฎ้ข็ฉใSmยฒ ้ใฎ็ใไธญใ้ใๅๅจใฎ้ทใใ lm ใจใใใจใ
S=alใจใชใใใจใ่จผๆใใชใใใ
18-
Im
rm.
am
Maroe
่ฑกSใใ
SF
E-
2
S=ฯ(r+ฮฑ)ยฒ -ฯrยฒ
=ฯ(rยฒ+2ar+aยฒ) -ฯrยฒ
=ฯrยฒ+2ฯar+ฯฮฑยฒ-ฯrยฒ
=2ะปar+ะปฮฑ
2
1 = 2ฯ (r + 1โ1โ1โ a )
=2ฯะณ+ะปะฐ
al=a(2ฯr+ะปะฐ)
=2ฯar+ะปะฐยฒโก
โ ใจโกใๅใๅผใซใชใใฎใง, S=al ใจใชใใ
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