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

Answer:

1017.36 square inches

Step-by-step 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

$Radius=r=\frac{d}{2}\\r=\frac{18}{2}\\r=9\ inches$

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 ..