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Question Number 147706 by aliibrahim1 last updated on 22/Jul/21

Answered by mr W last updated on 22/Jul/21

Commented by aliibrahim1 last updated on 22/Jul/21

$$sorrysiritriedtobuildonthatbeforesendingitdidntworkwithme$$

Commented by mr W last updated on 22/Jul/21

$$sayA(p,p^2)$$$$s=2p$$$$\beta =\frac{180-108}{2}=36°$$$$\alpha =108-36=72°$$$$x_B=p+2p\cos 72°$$$$y_B=p^2+2p\sin 72°$$$$p^2+2p\sin 72°=p^2{(1+2\cos 72°)}^2$$$$\sin 72°=2p\cos 72°(1+\cos 72°)$$$$p=\frac{\tan 72°}{2(1+\cos 72°)}$$$$y_C=y_B+2p\sin 36°$$$$y_C=p^2+2p(\sin 72°+\sin 36°)$$$$y_C=\frac{{\tan }^{2}72°}{4{(1+\cos 72°)}^2}+\frac{\tan 72°}{(1+\cos 72°)}(\sin 72°+\sin 36°)$$$$=5$$

Commented by aliibrahim1 last updated on 23/Jul/21

$$thankssirappreciateit$$

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