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- 2. = 1 ×
2 ×
3
_
× ( F )2
F F = 4
= s(s − a )(s − b )(s − c )
a s= a+b+c
b 2
c
- 3. = F × F
F = กF ×
= 1× ก F F ×
2
F = ×
=1 ×
2 F × ก F ก
- 4. F = กF x
= F x F
= 1 ×(
2 ก F F )×
F = x
= + F
- 5. = x
F = (ก F x )x
= ( F x F )x
3
F F = x( F )2 x
4
ก กF F
- 7. F F Fก
ก =
2
F ก = 2πr
ก = πr2
F π 1. F F F 22
7
2. F 3.14
- 8. F ก ก = 2πrh
ก ก( F ) = πr2
ก ก = 2πrh + 2(πr2)
ก ก = πr2h
h
r
r
h ก ก
- 9. r
h
R
ก กก = πR2h - πr2h
ก กก = πh (R2 - r2)
- 10. = F x F
F =กF x
= 1 ×
2 ×
- 11. F = F x (½x F x )
F =½x x
F = ×
2
- 14. l h
r
2
l = h2 + r2
F ก = πr l
ก = πr2
ก = πr l + πr2