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a. = 4 x 3,14 x 4²
= 4 x 3,14 , 16
= 200,96
b. Diameter = 24, jadi r = 24÷2 = 12
= 4 x 3,14 x 12²
= 4 x 3,14 x 144
= 1808,64
Semoga benar dan membantu
Dan mohon maaf jika ada kesalahan