Question

I need help and my teacher wont help

Answer 1

Answer:

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

Step-by-step 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 $\frac{3}{4}$, because the radii from the intact section are perpendicular.

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

                                            $d = 4 \times 2 = 8$

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