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23 dm
p=0,5*56*23
p=28*23
p=644dm
f= 2 * 23 = 46dm=4.6 m
P=e*f :2
P=12.88 dm2
Pole trójkąta (gdyby o niego chodziło w tym zadaniu:
P=1/2*a*h
P=644 cm kwadratowe
1/2(czyt. jedna druga)