1. 
Which formula would you use to calculate the circumference of a circle given the radius?
A.C=πr2

B.C=πr2

C.C=2πr

D.C=r2π


The correct formula to calculate the circumference of a circle given the radius is:

**C = 2πr**

So, the correct answer is **C. C = 2πr**.

This formula comes from the fact that the circumference of a circle is directly proportional to its diameter, which is twice the radius (2r), and the proportionality constant is π (pi).

Would you like further details or have any questions? 

Here are five questions to expand this topic:
1. How would the formula change if you were given the diameter instead of the radius?
2. Can you calculate the circumference of a circle with a radius of 5 cm?
3. What is the value of π to two decimal places?
4. How do you calculate the area of a circle?
5. How does the circumference of a circle compare to its area for the same radius?

**Tip:** Remember that the diameter of a circle is always twice the radius!

Which formula would you use to calculate the circumference of a circle given the radius? A. C = πr^2, B. C = πr^2, C. C = 2πr, D. C = r^2π

Learn how to calculate the circumference of a circle using the formula C = 2πr. This guide provides a step-by-step explanation of key geometry concepts and is perfect for students in Grades 5-7. Understand the relationship between radius, diameter, and the circumference of a circle.

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