yang nomor 15 kak.... yg no 14 udah plis no 15 pake caranya ya..

L1 = π × r²
= 22/7 × 14 × 14
= 616 cm²

L2 = ½ × d1 × d2
= ½ × 14 × 28
= 196 cm²

Lb = L1 - L2
= 616 - 196
= 420 cm²