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5) L1 = 20 × 20 = 400 cm²
L2 = ½ × 6 × 20 = 60 cm²
L3 = ½ × 3,14 × 10 × 10 = 157 cm²
Lb = L1 - L2 - L3 = 400 - 60 - 157 = 183 cm²
K1 = 4 × 20 = 80 cm
Kb = 20 + 20 + 13 + 13 + 80 - 20 = 126 cm

6) L1 = 16 × 5 = 80 cm²
L2 = ½ × 3,14 × 2 × 2 = 6,28 cm²
Lb = L1 + L2 = 80 + 6,28 = 86,28 cm²
K1 = ½ × 3,14 × 4 = 6,28 cm
Kb = 16 + 5 + 5 + 6,28 - 4 = 28,28 cm