Question

what is the formula for the area of a circle?

a. \\(a = \pi^2 r\\)

b. \\(a = \pi r d^2\\)

c. \\(a = 2\pi r\\)

d. \\(a = \pi r^2\\)

Explanation:

Identify the formula for the area of a circle

Using the Area of a Circle knowledge point

$$ A = \pi r^2 $$

where \(r\) represents the radius of the circle.

Answer:

• A. \(A = \pi^2 r\)
• B. \(A = \pi r d^2\)
• C. \(A = 2\pi r\)
• D. \(A = \pi r^2\) (Correct answer)