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K = πd
88 = 22/7 d
d = 88 x 7/22
= 28 cm
r = 1/2 d
= 1/2 x 28
= 14 cm
L = πr²
= 22/7 x 14 x 14
= 616 cm²
88 cm = 2 x x r
r = 14 cm
jadi jari-jarinya = 14 cm
diameternya = 28 cm
luas = π x r²
= x 14 x 14
= 616cm²