The formula for the area of a circle is __________.
A) pi * the radius
B) pi * the diameter
C) pi * the diameter squared
D) pi * the radius squared

Question

Quizplus · Accepted Answer

The formula for the area of a circle is pi multiplied by the radius squared. This means that if you know the radius of a circle, you can find its area by squaring the radius and multiplying that result by pi. Choice A is incorrect because pi times the radius would give the circumference of the circle. Choice B is incorrect because pi times the diameter would give the circumference of the circle, which is not the same thing as the area. Choice C is incorrect because pi times the diameter squared involves multiplying the diameter by itself and then multiplying that result by pi, which is not the same as squaring the radius.

The Formula for the Area of a Circle Is __________