Odpowiedzi

2010-04-15T14:53:55+02:00
A*h:2= 40
a*8:2= 40
40:8*2=10

A= 10cm
2010-04-15T14:54:07+02:00
P = ½ × a × h
P = ½ × a × 8
40 = ½a × 8
40 = 4a /: 4
a = 10