GED Math Practice Test

Disable ads (and more) with a membership for a one time $4.99 payment

Prepare for the GED Math Test with our interactive quizzes, including flashcards and multiple-choice questions with hints and explanations. Get ready to ace your exam!

Practice this question and more.

Which formula represents the circumference of a circle?

A = πr²
P = 2l + 2w
c = πd
r = d/2

The correct answer is: c = πd

The formula that represents the circumference of a circle is indeed c = πd, where c stands for circumference and d stands for the diameter of the circle. This formula indicates that the circumference is proportional to the diameter with π (pi) being the constant of proportionality, which is approximately 3.14. This relationship is fundamental in geometry, as it allows us to calculate the distance around a circle based on its diameter. The other formulas provided do not relate to the circumference of a circle. For instance, A relates to the area of a circle, calculated using the radius (r). The formula B represents the perimeter of a rectangle, calculated by adding twice the length and twice the width. Option D describes the relationship between radius and diameter, whereby the radius is half of the diameter, but it does not give a measure for the circumference itself.