The radius of a circle is tripled. what happens to the area of the circle?

a) area is multiplied by 3

b) area is multiplied by 9

c) area is multiplied by 6

d) area is multiplied by 1/3

Question

SAT

Eddie Mays

14 October, 05:40

The radius of a circle is tripled. what happens to the area of the circle?

a) area is multiplied by 3

b) area is multiplied by 9

c) area is multiplied by 6

d) area is multiplied by 1/3

+2

Answers (2)

Know the Answer?

Cecelia Waller · Answer 1

Answer is b) area is multiplied by 9

Kasey Cooley · Answer 2

b) area is multiplied by 9

Explanation:

The formula of the area of a circle is A = π*r^2. If the radius is tripled, this means that you'll multiply the radius by 3, so the new radius will be 3r. If you do the formula with this new value you will get:

A = π * (3r) ^2

A = π*9r^2

So the effect on the area is that it will increase nine times.

The radius of a circle is tripled. what happens to the area of the circle?a) area is multiplied by 3b) area is multiplied by 9c) area is multiplied by 6d) area is multiplied by 1/3

The radius of a circle is tripled. what happens to the area of the circle?

a) area is multiplied by 3

b) area is multiplied by 9

c) area is multiplied by 6

d) area is multiplied by 1/3