Question

Clara is asked to find the surface area of a sphere which has radius​ r, of 18 in. She says the surface area is 226.08 in. squared. What is the surface area of the​ sphere? What is Clara​'s likely​ error? Use 3.14 for pi.

The surface area of the sphere is about

​(Type an integer or decimal rounded to the nearest hundredth as​ needed.)
What is Clara​'s likely​ error?
A.
Clara did not multiply by 3.14.
B.
Clara did not multiply by four when solving.
C.
Clara did not square the radius when solving.

Answer 1

The surface area of the sphere is approximately 4071.5.

Explanation:

You can find the surface area of a sphere using this formula: A=4πr^2!

Answer:

C. Clara did not square the radius when solving.

Explanation:

She likely solved it like so:

18 x 3.14 = 56.52

56.52 x 4 = 226.08

Through this process, she forgot to square the radius!