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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 :))

User Rodent
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1 Answer

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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.

User Zeckdude
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