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6) L1 = p × l = 18 × 4 = 72 cm²
s = √ 6² + 6² = √36+36 = √72 = 6√2
L2 = s² = (6√2)² = 72 cm²
L3 = ½ × a × t = ½ × 6 × 6 = 18 cm²
Lttl = 72 + 72 + 18 = 162 cm²

7) L1 = p × l = 14 × 8 = 112 cm²
L2 = p × l = 12 × (14 - 10) = 12 × 4 = 48 cm²
Lttl = 112 + 48 = 160 cm²

8) L1 = p × l = 16 × 8 = 128 cm²
L2 = p × l = 18 × (16 - 8) = 18 × 8 = 144 cm²
L3 = ½ × a × t = ½ × 9 × 8 = 36 cm²
Lttl = 128 + 144 + 36 = 308 cm²