Odpowiedzi

2010-03-29T15:38:21+02:00
Przekątna podstawy - x
a = 15cm
b = 20cm
h = 30cm
x²=a²+b²
x² = 15²+20²
x² = 225+400
x² = 625
x = 25cm

P = 2*Pp+ Pb1+Pb2+Pb3
Pp = a*b/2
Pp = 15*20/2
Pp = 150cm²

Pb1 = a*h
Pb1 = 15*30
Pb1 = 450 cm²

Pb2 = b*h
Pb2 = 20*30
Pb2 = 600 cm²

Pb3 = x*h
Pb3 = 25*30
Pb3 = 750 cm²

P = 2*150 + 450 + 600 + 750
P = 2100 cm²