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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
2.)L = πr²
314 = 3,14 × r²
r² = 100
r = 10
K = 2πr
= 2 × 3,14 × 10
= 62,8 cm
Jadi, keliling lingkaran 62,8 cm