Question

The area of a circle is 379.94m². Using 3.14 for π, find the circumference of the circle.

Answer 1

Question:

Find the circumference of the circle. Use 3.14 for π.

5 in.

Answer:

15.7 inches

Explanation:

Identify the diameter of the circle.

d = 5 in.

Use the formula.

C = πd

C = π(5) Substitute 5 for d.

C ≈ 3.14(5) Substitute 3.14 for π.

C ≈ 15.7 Multiply.

The circumference of the circle is about 15.7 inches.

Answer 2

69.08

Explanation:

The equation for circumference is C = 2πr and the equation for area is A = πr^2. First, do 379.94 = 3.14r^2. This means that r^2=121 so r=11. Now plug it in to C=2πr so it becomes C=2π(11). So C=22π or 69.08.