tolong dong fren...sekalian sama jalannya...luas lingkaran...

8.
L = πr²
L = 3,14 . 40 . 40
L = 3,14 x 1.600
L = 5.024 cm²

9.
L = πr²
L = 3,14 . 46 . 46
L = 3,14 x 2.116
L = 6.644,24 cm²