1 10 + 10 + 4√2 × 10 × 6 10 cm 6 cm 2 = 20 + 4√2 = 30 6 cm 4 cm 2(6 + 4) = 20 6 × 4 = 24 1 (2 × 5) + 6 × 6 × 4 6 cm 4 cm 2 = 16 = 12