pole powierzchni calkowitej prostopadloscianu obliczamy ze wzoru P=2ab + 2ah +bh, gdzie a, b i h sa dlugosciami krawedzi prostopaloscianu. wyznacz a z podanego wzoru
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P=2ab + 2ah +bh
P- bh = a(2b + 2h) /: (2b+2h)
a = (P-bh)/(2b+2h)
P=2ab+2ah+bh
2ab+2ah=bh-P
a(2b+2h)=bh-P /:(2b+2h)
a=bh-P/2b+2h
a=bh-P/2(b+h)
a=1/2* (bh-P)/(b+h)