Question

Can someone help me please???

Answer 1

35,691

Explanation:

First step, look at the diagram and you see that you have a sphere and a cone.

The total surface area of a sphere is

`A = 4\pi r^(2) \\A = 4\pi 39^(2) \\A = 19,113`

Since you only have half of a sphere, the surface area is 9,556.5

The surface area of the cone is

`A = pi r(r+\sqrt{h^(2)+r^(2) }) A = \pi39(39+\sqrt{42^(2) +39^(2) } \\A=11,800`

You don't need the bottom of the cone however as it is connected to the half sphere.

So substract the area of a circle with a radius of 39 from the product of 19,113 + 11,800

The area of the circle is 4,778