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P=1/2*a*h
P=1/2*4cm*5cm
P=1/2*20cm²
P=10cm²
b)
2dm=20cm
P=1/2*a*h
P=1/2*8cm*20cm
P=1/2*160cm²
P=80cm²
c)
0,4m=4dm
P=1/2*a*h
P=1/2*4dm*3dm
P=1/2*12dm²
P=6dm²