Odpowiedzi

2010-01-18T19:22:53+01:00
A) 5 razy 3 razy 5 razy 8cm
B1,2dm razy 1,5dm razy 0 razy20dm
2010-01-18T19:27:10+01:00
A)
a = 5 cm
b = 3,5 cm
h = 8 cm
P = 2ab + 2ah + 2bh
P = 2 x (5 cm + 3,5cm) + 2 x (5cm + 8cm) + 2 x (3,5 cm x 8 cm) = 69 cm 2

a = 10 cm
b = 7 cm
h = 16 cm

P = 2 x (10 cm + 7 cm) + 2 x (10 cm + 16 cm) + 2 x (7 cm + 16 cm) = 98 cm 2

98 cm 2 : 69 cm 2 = 1,5 razy

b) a = 12 cm
b = 15 cm
h = 2 cm

P = 2 x (12 cm + 15 cm) + 2 x (12 cm + 2 cm) + 2 x (15 cm + 2 cm) = 112 cm 2

a = 24 cm
b = 30 cm
h = 4 cm

P = 2 x (24 cm + 30 cm) + 2 x (24 cm + 4 cm) + 2 x (30 cm + 4 cm) = 228 cm 2

228 cm 2 : 112 cm 2 = 2 razy