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P= a x h÷2
p= 23 x 56 ÷ 2= 644 [dm²]
5,6m=56 dm
(56*23)/2=1288/2=644 dm2
pole wynosi 644dm2
h=23dm
P=a*h/2
P=56*23/2
P=1288dm²/2
p=644 dm²
odp.Pole tego trójkąta wynosi 644 dm²