Question

Tolong dibantu pakai cara ya.....

Answer 1

R = 1/2 x d
  = 1/2 x 21 cm
  = 10,5 cm
Luas daerah yang diarsir
= 4/6 x Luas lingkaran
= 4/6 x 22/7 x (10,5 cm)²
= 2/3 x 22/7 x 110,25 cm²
= 44/21 x 110,25 cm²
= 4,851/21 cm²
= 231 cm²

Answer 2

R = 21/2

4/6 πr²
4/6 . 22/7 . (21/2)²
4/6 . 22/7 . 21/2 . 21/2
2/3 . 33 . 21/2
22 . 21/2
11 . 21
231 cm²
Jawabannya A.