Understanding Circumference of a Circle

The video tutorial from MooMooMath explains how to find the circumference of a circle. It introduces the formula for circumference, which can be expressed as either the diameter times pi or two times the radius times pi. The tutorial prefers using the diameter times pi formula. An example is provided where the diameter is calculated from the radius, and the circumference is computed using the formula. The video concludes by comparing circumference to the perimeter of a polygon and reiterating the formulas used.

What is the formula for circumference when using the diameter?

• d times pi

• 2 times pi

• pi squared

• r times pi

Tags

CCSS.7.G.B.4

If the radius of a circle is 4, what is the diameter?

• 4

• 16

• 2

• 8

Tags

CCSS.7.G.B.4

How do you calculate the circumference if the diameter is 8?

• 8 times 3.14

• 8 minus 3.14

• 8 plus 3.14

• 8 divided by 3.14

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a diameter of 8?

• 31.4

• 25.12

• 16.28

• 12.56

Which of the following is true about circumference?

• It is the area of a circle.

• It is the distance around a circle.

• It is the volume of a circle.

• It is the radius of a circle.