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2009-11-30T15:30:03+01:00
P [trapezu] = (a+b)*h / 2
P = (2+8)*4 / 2
P = 20 cm2

L = a + b + c + d
L = 2 + 8 + 5 +5
L = 20 cm

V = Pp * H
H = V / Pp
H = 160 / 20
H = 8 cm

P [boczna]

P1 = a * H
P1 = 2 * 4
P1 = 8 cm2

P2 = b * H
P2 = 8 * 4
P2 = 32 cm2

P3 = c * H
P3 = 5 * 4
P3 = 20 cm2

P4 = d * H
P4 = 5* H
P4 = 20 cm2

P [boczna] = P1 + P2 + P3 + P4
Pb = 8 + 32 + 20 + 20
Pb = 80 cm2
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