Odpowiedź:
1)
b)
P = ½* d1 * d2
P = ½ * 4 cm * 11 cm= 2 cm * 11 cm = 22 cm²
d)
P = a * h
P = 7 cm * 8 cm = 56 cm²
2)
a)
P = a * h
a = 2 dm = 20 cm = 200 mm
h = 9 mm = 0,9 cm
P = 20 cm * 0,9 cm = 18 cm²
Lub :
P = 200 mm * 9 mm = 1800 mm².
b)
P = a * h
a = 4 cm = 40 mm
h = 4 mm
P = 40 mm * 4 mm = 160 mm²
3)
P = a * h
a = 5 cm
h = 3 cm.
P = 5 cm * 3 cm = 15 cm²
Obw = 2 * a + 2 * b
a = 5 cm , b= 4 cm
Obw = 2 * 5 cm + 2 * 4 cm = 10 cm + 8 cm = 18 cm.
