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70 = d
maka r = 35
luas = 22/7 × 35 × 35
luas = 3850 cm²
220 = 2 x 22/7 x r
220 = 44/7 x r
220 x 7/44 = r
5x7 = r
35 = r
luas = phi x r x r
= 22/ 7 x 35 x 35
= 22 x 5 x 35
= 3850 cm³