Question

8. A welder is making a metal sphere. The radius will be 115 cm. What is the surface area of the metal​ sphere? Use 3.14 for π.

9. Thirty percent of the metal sphere will be covered in a metal that is tinted red. What is the area of the section of the sphere that is tinted​ red?

please help :))

Answer 1

Explanation:

Given that,

8. The radius of a sphere, r = 115 cm

We need to find the surface area of the metal​ sphere. The formula for the surface area of a sphere is given by :

`A=4\pi r^2`

Put all the values,

`A=4* 3.14 * (115)^2\\\\=166106\ cm^2`

9. Thirty percent of the metal sphere will be covered in a metal that is tinted red.

So, the area of the section that is tinted red is :

`A=30\%\ of\ 166106\\\\=(30)/(100)* 166106\\\\=49831.8\ cm^2`

Hence, this is the required solution.