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P = a + b x h /2
Rozwiązanie :
p = 3cm + 11,6 cm x 2,9 / 2
p = 14,6 cm x 2,9 / 2 = 42,34 /2 = 21,17
100 % to 11,6
25 % to 2,9 11,6 : 4 = 2,9 :)
Pole trapezu wynosi 21,17 xD
P = [(a+b)*h]/2
P = [(3+11,6)*2,9]/2 = [14,6 * 2,9]/2 = 21,17 [cm2]