Which expression represents the circumference of a circle in terms of its radius?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the PSAT/NMSQT Test with our comprehensive quizzes. Use interactive flashcards and multiple-choice questions, complete with hints and explanations, to get ready for exam day!

Multiple Choice

Which expression represents the circumference of a circle in terms of its radius?

Explanation:
The circumference of a circle is the distance around it, and it relates to the radius through the constant pi. The standard formula using the radius is C = 2πr. This comes from the more general C = πd, since the diameter is twice the radius (d = 2r). Substituting gives C = π(2r) = 2πr. Remember, πr^2 is the area of a circle, not its circumference, and r^2 has no direct meaning as a circumference. So the expression in terms of the radius is C = 2πr.

The circumference of a circle is the distance around it, and it relates to the radius through the constant pi. The standard formula using the radius is C = 2πr. This comes from the more general C = πd, since the diameter is twice the radius (d = 2r). Substituting gives C = π(2r) = 2πr. Remember, πr^2 is the area of a circle, not its circumference, and r^2 has no direct meaning as a circumference. So the expression in terms of the radius is C = 2πr.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy