Kelsey is given a circle with a radius of 5 cm. She calculates the area of a sector that has an angle of 216°

Question

and provides the solution of 3π cm2
. What was her mistake?

Option #1: She incorrectly calculated 216°360°
.

Option #2: She forgot to square the radius.

Option #3: She calculated the circumference instead of the area.

(1 point)
Option #
describes Kelsey’s mistake.

Answer 1

Option #3: She calculated the circumference instead of the area.

The formula for the area of a sector of a circle is A = (θ/360)πr^2, where θ is the angle in degrees and r is the radius. Therefore, Kelsey should have used this formula to calculate the area, rather than calculating the circumference.