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luas = πr(kuadrat)
= 22/7 × 7×7
= 154cm(kuadrat)
154 = 2 × 22/7 × r
154 : 22/7 = 2r
49 = 2r
r = 49/2 = 24,5 cm
luas = π.r²
= 22/7 × 24,5²
= 22/7 × 600,25 = 1886,5 cm²