Răspuns:
a) A = 25 cm²
b) A = 50 cm²
c) A = 22,5 cm²
Explicație pas cu pas:
a) B=6m, b=4m, h=5m
A = (6 + 4) x 5 / 2 = 50/2 = 25 cm²
b) B=13dm, b=7dm, h=5dm
A = (13 + 7) x 5 / 2 = 100/2 = 50 cm²
c) B =5cm, b=10cm, h=3cm
A = (5 + 10) x 3 / 2 = 45/2 = 22,5 cm²
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