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P = 80/2 = 40
nazwij polowki przekatnych x i y
Dane:
x=5
y=4
bok a ztw pit--->a²=x²+y²
a²=25+16=41------>a=√41
obwod=4*√41cm
pole to 4 trojkaty
P=4*1/2xy=2xy=2*4*5=40cm²