💈正圓變成正五邊形

SwiftUI ⟩ shapes ⟩ circle to pentagon

用極方程式表示正五邊形。

r = \begin{cases} \dfrac{R \cos(\frac{\pi}{5})}{\cos(\theta - a[1])} & \text{if } \ v[1] \le x < v[2] \\ \\ \dfrac{R \cos(\frac{\pi}{5})}{\cos(\theta - a[2])} & \text{if } \ v[2] \le x < v[3] \\ \\ \dfrac{R \cos(\frac{\pi}{5})}{\cos(\theta - a[3])} & \text{if } \ v[3] \le x < v[4] \\ \\ \dfrac{R \cos(\frac{\pi}{5})}{\cos(\theta - a[4])} & \text{if } \ v[4] \le x < v[5] \\ \\ \dfrac{R \cos(\frac{\pi}{5})}{\cos(\theta - a[5])} & \text{if } \ v[5] \le x < v[1]+2 \pi \end{cases}

Last updated 1 year ago

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