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4x 22/7xr²= 154
88/7r² = 154
r² =1.078 /88 = 12,25
r = 3,5
vol = 4/3π r³ = 4/3 x 22/7 x 12,5 x3,5
= 179,66 cm³ atau 179 2/3 cm³
154=4x22/7xr²
154=88/7xr²
154:88/7=r²
154x7/88=r²
1078/88=r²
r²=12,25
r=√12,25
r=3,5 cm
V= 4/3xΠxr³
= 4/3x22/7x3,5³
= 3773/21
=179,67 cm³