w ostroslupie prawidlowym pieciokatnym krawedz podstawy ma dlugosc 2 dm, a krawedz boczna ma 10 dm. oblicz pole powierzchni bocznej tego ostroslupa
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hb2 = k2 - (a/2)2
k = 10dm a= 2dm
hb2 = 100 - 1 = 99
hb = 3√11 dm
Pb = 5*(1/2)*a*hb
Pb = 5*1* 3√11
Pb = 15√11 dm2