Odpowiedź:
Zad.1
a = 4 cm
b = 12 cm
P = 4*12 = 48 cm2
Zad.2
P = 36 cm2
a = 6 cm
Zad.3
P = (e*f) /2
(4*f)/2 = 36
4*f = 72
f = 18
Odp. C
Zad.4
e = 2 dm = 20 cm
f = 14 cm
P = (e*f)/2
P = (20*14)/2 = 280/2 = 140 cm2
Zad.5
P = a*h = 10*4 = 40 cm2
Odp. D
Zad.6
a) P = (a*h)/2 = (6*4)/2 = 12 cm2
b) P = (a*h)/2 = (4*3)/2 = 6 cm2
c) P = (a*h)/2 = (5*7)/2 = 17,5 cm2
Zad.7
P = (a + b)*h/2 = (6 + 4 + 2)*5/2 = 30 cm2
Zad.8
a) P = a*a = 8*8 = 64 cm2
b) 45/9= 5 cm
