OB = OC = OA+AB = 30
K arsir = 108/360 . 2π.30 + 108/360 . 2π.20
= 108/360 . 2π.50
= 0,3.50.2π
= 15.2π
= 30π
K arsir = 94,2 cm
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OB = OC = OA+AB = 30
K arsir = 108/360 . 2π.30 + 108/360 . 2π.20
= 108/360 . 2π.50
= 0,3.50.2π
= 15.2π
= 30π
K arsir = 94,2 cm