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88=2.22/7.r
88=6.28.r
r=88/6.28=14
88 = 2 x 22/7 x r
88 = 44/7 x r
88x 7/44 = r
2 x 7 = r
14 = r
maka jari-jarinya = 14
luas = phi x r²
= 22/7 x 14 x 14
= 22 x 2x 14
= 44 x14
= 528