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88 = 22/7 × d
88 × 7/22 = d
4 × 7 = d
28 m = d
r = d/2
= 28/2
= 14 m
b. L = πr²
= 22/7 × 14 × 14
= 22 × 2 × 14
= 616 m²
88= 2 x 22/7 x r
88= 44/7 r
r= 88 x 7/44
r= 2 x 7= 14m ------- d= 2(14)= 28m
luas=
= 22/7 x 14 x 14
= 616 m2