Question

You blow a bubble in the shape of a sphere. It has a radius of 6 inches. Which choice is closest to its surface area? Use 3.14 to approximate pi.

Answer 1

To solve for the surface area of a sphere, the formula is 4*pi*r^2. Since we are using 3.14 instead of pi, the formula becomes 4*3.14*r^2. To solve, all we have to do is substitute in the radius for r and solve it like a normal question.

SA=4*3.14*r^2
SA=4*3.14*6^2
SA=452.16

Since we used 3.14 instead of pi, we have to say this is an approximate answer. This means the surface area of this sphere is 452.16 square inches.