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3,5^2+h^2=13,5^2
12,25+h^2=182,25
h^2=182,25-12,25
h^2=170
h=√170
P = (a*h)/2
P= 7√170/2=3,5√170
Takie ściany mamy 3
Ppb=3*3,5√170=10,5√170
Pp = (a²√3)/4=(7²√3)/4=(49√3)/4
Ppc=10,5√170+(49√3)/4=(42√170)/4+(49√3)/4=(42√170+49√3)/4