Question

I need help and my teacher wont help

Answer 1

`\bold{8\pi}` or
`\bold{25.12}`

Explanation:

We know that as shown by the diagram, the radius is 4. So in this case, we want to find the circumference of the entire circle, then just multiply by
`(3)/(4)`, because the radii from the intact section are perpendicular.

The circumference of a circle is just
`\pi * d` where
`d` is the diameter of the circle. The diameter is just the radius
`* 2` which gives us

`d = 4 * 2 = 8`

Thus lending us
`8\pi` or
`25.12` if we substitute
`\pi` with 3.14.