S_(полной поверхности)=S_(боковой поверхности) + S_(осн)
S_(осн)=x^2
S_(боковой поверхности)=4S_( Δ SCD)
S_( Δ SCD)=(1/2)CD*SK
CD=x
cos α =OK/SK ⇒ SK=OK/cos α
SK=x/(2*cos α)
S_(боковой поверхности)=4*(1/2)*x*(x/(2*cos α))=x^2/cos α
S_(полной поверхности)=x^2+(x^2/cos α)
S_(полной поверхности)=[b]S[/b]
x^2+(x^2/cos α) =[b]S[/b]
x^2(1+(1/cos α ))=[b]S[/b]
⇒
x=sqrt([b]S[/b]cos α /(1+cos α ))
V=(1/3)*S_(осн)*Н
Н=SO
SO=OK*[blue]tg α[/blue] =sqrt([b]S[/b]cos α /(1+cos α ))*[blue]tg α [/blue]
V=(1/3)*x^2*Н=(1/3)*([b]S[/b]cos α /(1+cos α ))*sqrt([b]S[/b]cos α /(1+cos α ))*[blue]tg α [/blue]=