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 Aug14 awarded Notable Question Jul14 awarded Notable Question Jul2 awarded Curious Jun20 awarded Notable Question Apr8 awarded Tumbleweed Jun14 awarded Popular Question May14 awarded Popular Question Jan19 awarded Popular Question Aug15 asked What is a cyclic integral? Jul27 awarded Yearling Jul6 comment How can I find the area of the shadow? It is easy to see that the shadow is circle with center at C and radius EC or CD I'm sorry I do not see how this is the case. As @JosuéMolina mentioned, why can't it be an oval? Jul6 comment How can I find the area of the shadow? @BenMillwood I'm sure the shape changes but the area might be constant. Jul6 asked How can I find the area of the shadow? Jun8 awarded Caucus Feb1 comment Solve $\theta''+g\sin(\theta)=0$ @yoyo I simplified a step further & got this equation : $\frac{d\theta}{\sqrt{2C+2gcos\theta}}=dt$ I'm not sure I can integrate this. Feb1 awarded Commentator Feb1 comment Solve $\theta''+g\sin(\theta)=0$ Thanks. Seems obvious now that you have shown it. Feb1 comment Solve $\theta''+g\sin(\theta)=0$ Can you explain how it is in separable form? I'm a beginner so please bear with me.. Feb1 comment Solve $\theta''+g\sin(\theta)=0$ @yoyo Can't it be done without the small angle approximation? I wanted to derive a general equation for all cases. Anyways I don't know how to solve even with the approximation, so it'll be helpful even if you explain that method. Feb1 asked Solve $\theta''+g\sin(\theta)=0$