S = 4 ⋅ 5 + 3 ⋅ 3 = 29 m2 S = 4 ⋅ 8 - 1 ⋅ 3 = 29 m2
a) S = 36 dm2 b) S = 96 sm2
a) P = 42 sm b) P = 50 dm