Odpowiedź:
P=1/2(a+b)×h
p=1/2(4+5+7)×3
p=1/2×16×3
p=8×3
p=24cm^2
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Odpowiedź:
P=1/2(a+b)×h
p=1/2(4+5+7)×3
p=1/2×16×3
p=8×3
p=24cm^2