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k= 2(phi) r
cari dulu r nya
88 = 2 (22/7) r
r = 14 cm
jadi luasnya
(phi)r^2 = (22/7) x 14^2 =616 cm2
K = 88 cm
maka
K = 2 x π x r
88 = 2 x 22/7 x r
88 = 44/7 x r
r = 14
L = π x r²
= 22/7 x 14²
= 616 cm