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P=(15+7)*3/2=33cm kwadratowych
(a+b)*h
---------
2
h można obliczy z twierdzenia pitagorasa
h²=c²-((a-b)/2)²
h²=5²-((15-7)/2)²
h²=25-16
h²=9
h=3
Pole= (15+7)*3/2= 33cm²
obwód= 2*5+15+7=32cm