Calculating the Circumference of a Circle

This video tutorial explains the concept of circumference, the distance around a circle. It covers the formulas for calculating circumference using pi and diameter or radius. The video includes example problems to demonstrate these calculations and addresses special cases like donuts and tires. The tutorial concludes with a summary of the key points discussed.

What term is used to describe the distance around a circle?

• Circumference

• Radius

• Diameter

• Perimeter

What is the estimated value of pi used in the calculations within the video?

• 3.14

• 22/7

• 3.142

• 3.14159

Which formula is used to calculate the circumference when the diameter is known?

• C = 2 * pi * R

• C = pi * D

• C = D / pi

• C = R * pi

If the radius of a circle is given, which formula should be used to find the circumference?

• C = 2 * R * pi

• C = R / 2 * pi

• C = 2 * pi * R

• C = pi * D

How does the radius relate to the diameter of a circle?

• It is double the diameter

• It is half the diameter

• It is equal to the diameter

• It is one-fourth the diameter

In the context of the video, if a circle's diameter is 8 units, what is the circumference using the estimated value of pi?

• 25.12 units

• 16 units

• 24 units

• 50.24 units

What should you do if a problem asks for the circumference 'in terms of pi'?

• None of the above

• Leave the pi in the expression

• Divide by pi

• Multiply by pi

What is the circumference of a circle with a radius of 6.5 units using the estimated value of pi?

• 20.41 units

• 6.5 units

• 13 units

• 40.82 units

Does the size of a hole in the center of a doughnut affect the circumference of the doughnut?

• Yes, it decreases the circumference

• Yes, it increases the circumference

• No, it does not affect the circumference

• It depends on the doughnut

If a tire has a radius of 13.5 inches, how far will it travel in one full rotation?

• 13.5 inches

• 42.39 inches

• 27 inches

• 84.78 inches