Question

A classroom globe has a diameter of 18 inches.   Which of the following is the approximate surface area, in square inches, of the globe? (Surface Area = 4r2)​

Answer 1

1017.36 square inches

Explanation:

The globe is in the shape of a sphere. As we given the diameter of the globe

d = 18 inches

We have to find the radius of globe first

`Radius=r=(d)/(2)\\r=(18)/(2)\\r=9\ inches`

The formula for finding the surface area is:

`Surface\ Area=4\pi r^(2)\\Putting\ the\ values\ of \pi \ and\ r\\Area=4*3.14*(9)^(2) \\=4*3.14*81\\=1017.36\ square\ inches`

Hence, the surface area is 1017.36 square inches ..