The degree measure of the angle at the centre of a circle is theta. The length of an arc of the sector is:
`\frac{\theta\pi r}{\sqrt{90}}`
`\frac{\theta\pi r}{\sqrt{180}}`
`\frac{\theta\pi r}{\sqrt{270}}`
`\frac{\theta\pi r}{\sqrt{360}}`
`\frac{\theta\pi r}{\sqrt{90}}`
`\frac{\theta\pi r}{\sqrt{180}}`
`\frac{\theta\pi r}{\sqrt{270}}`
`\frac{\theta\pi r}{\sqrt{360}}`
`\frac{\theta\pi r}{\sqrt{360}}`
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