Odpowiedzi

2010-03-29T21:41:57+02:00
2 * 10 cm + 2* 12 cm = 20 cm + 25 cm = 45 cm
2010-03-29T21:48:47+02:00
10cm : 2 = 5cm
12cm : 2 = 6cm

a₂ + b₂ = c₂
5² + 6² = c²
25 + 36 = c²
c² = 61cm² /√
c ≈ 8cm

obw = 4 × 8cm = 32 cm