Hitunglah keliling dan luas bangun yang di arsir berikut ini!

Waduh dikira mudah ternyata sysah

A. L = 60°/360° × 22 × 42 × 42 = 924cm^2
Kll = 60°/360° × 84 = 44cm

B. L1= 90°/360° × 22/7 × 18 × 18 = 254,57cm^2
L2= 90°/360° × 22/7 × 12 × 12 = 113,4cm^2
L yg diarsir = L1 - L2 = 141,43cm^2

Kll 1 = 90°/360° × 22/7 × 2 × 18 = 28,28cm
Kll 2 = 90°/360° × 22/7 × 2 × 12 = 18,85cm
Kll yg diarsir = kll 1 - kll 2 = 9,43cm

Maaf kalo salah..