Formula for the area of a circle: A = pi x r^2
We are given the diameter in this problem, but we need the radius. To find the radius, we will need to divide the diameter by 2.
8 / 2 = 4
A = pi x 4^2
A = pi x 16
A = 16pi cm^2
Hope this helps!! :)
Answer:

The net in the attached figure
Step-by-step explanation:
we know that
The surface area of the square pyramid using a net, is equal to the area of a square plus the area of its four lateral triangular faces
so
![SA=16^2+4[\frac{1}{2}(16)(13)]](https://tex.z-dn.net/?f=SA%3D16%5E2%2B4%5B%5Cfrac%7B1%7D%7B2%7D%2816%29%2813%29%5D)

We know that
<span>when a circle is divided into four equal parts, we will get 4 right angles
</span>so
360°/4=90° each part
see the attached figure to better understand the problem