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P=0,5(3dm)1,5dm
P=2,25dm2
2)a+b+h=24cm
h=a+2
h=b+4[cm]
h-2cm=a
h-2cm+h+h-4cm=24cm
3h=30
h=10
a=8
b=6
P=0,5(14)x10=70cm2
P trapezu = ½ * ab * h
P trapezu = ½ * 3 dm * 1,5 dm
P trapezu = 1,5 dm * 1,5 dm
P trapezu = 2,25 dm²
(24 - 2 - 4) : 3 = 18 : 3 = 6
a - 6 + 2 = 8 cm
b - 6 cm
h - 6 + 4 = 10 cm
P trapezu = ½ * (a+b) * h
P trapezu = ½ * (8+6) * 10
P trapezu = ½ * 14 * 10
P trapezu = 7 * 10
P trapezu = 70 cm²
P.S. * - razy ;).