bantu ya...............

- Bangun Datar -

K = 66 dm
2πr = 66
2(22/7)r = 66
44/7 r = 66
r = 66 x 7/44
r = 10,5 dm

L = πr²
L = (22/7)(10,5)²
L = 346,5 dm²

Jawaban :B

semoga membantu
-vin

mencari diameter
K = 3,14 x D
66dm = 22/7 x D
66dm x 7/22 = D
21 dm = D
10,5 dm= r

Luas
phi x r x r
22/7 x 10,5 dm x 10,5 dm
346,5 dm2