1 × 8 × 6 8 cm 6 cm 8 + 6 + 10 = 24 2 = 24 2(10 + 4√2 10 × 6 10 cm 6 cm = 20 + 8√2 = 60 10 + 10 1 × 10 × 6 10 cm 6 cm + 4√2 2 = 30 = 20 + 4√2 6 cm 4 cm 2(6 + 4) = 20 6 × 4 = 24