no.3 dan no. 5 yaaa

3) L1 = p × l = 10 × 8 = 80 cm²
L2 = ½ × π × r² = ½ × 3,14 × 4 × 4 = 25,12 cm²
L yg diarsir = 80 - 25,12 = 54,88 cm²

5) L1 = 2 × 2 = 4 m²
L2 = 2 × (3 × 2) = 12 m²
Lttl = 4 + 12 = 16 m²