tolong ya kak pakai cara makasihhhh

4. L1 = 1:2 x 3,14x 20x 20
= 1:2 x 3,14x 400
= 1:2 x 1.256
= 628 cm^2
L2 = 1:2 x 20x 20
= 1:2 x 400
= 200 cm^2
L1 + L2 = 828 cm^2
Maaf kalo slh