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88 = 2× 22/7 × r
88 = 44/7 × r
14 =r
Luas = phi × r×r
= 22/7 ×14 ×14
= 22 ×2 ×14
= 44× 14 =616 cm^2
R=7
L=Phi×R×R
=22/7×7×7=154 cm2