1/2( a+ b) * h = 1/2 (10 + 2) * 5= 1/2*12*5= 30
jedną drugą skracasz z 12
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1/2( a+ b) * h = 1/2 (10 + 2) * 5= 1/2*12*5= 30
jedną drugą skracasz z 12