Finding the Circumference of Circles

This video tutorial explains how to find the circumference of a circle using two formulas: one with the diameter and one with the radius. It provides step-by-step examples of calculating circumference in different units and explains how to express answers in terms of Pi for more precision. The tutorial covers practical examples and emphasizes understanding the relationship between diameter, radius, and Pi.

What is the circumference of a circle?

• The area inside the circle

• The distance around the circle

• The length of the diameter

• The length of the radius

Which formula is used to find the circumference with the diameter?

• C = 2πr

• C = πd

• C = πr^2

• C = 2r

If a circle's diameter is 8 meters, what is its circumference?

• 100.48 meters

• 25.12 meters

• 50.24 meters

• 12.56 meters

How do you calculate the circumference if you are given the radius?

• Divide the diameter by 2π

• Multiply 2π by the radius

• Multiply the diameter by π

• Multiply the radius by π

What is the circumference of a circle with a radius of 7 centimeters?

• 87.92 centimeters

• 22.00 centimeters

• 14.00 centimeters

• 43.96 centimeters

What does it mean to express the circumference in terms of Pi?

• Multiplying Pi by the diameter

• Leaving the Pi symbol in the answer

• Converting Pi to its decimal form

• Dividing the circumference by Pi

If the radius of a circle is 5 feet, what is its circumference in terms of Pi?

• 15π feet

• 5π feet

• 20π feet

• 10π feet

For a circle with a diameter of 14 millimeters, how is the circumference expressed in terms of Pi?

• 56π millimeters

• 7π millimeters

• 28π millimeters

• 14π millimeters

What is the circumference in terms of Pi for a circle with a diameter of 32 centimeters?

• 96π centimeters

• 64π centimeters

• 32π centimeters

• 16π centimeters

A circle has a radius of 2.5 feet. What is its circumference in terms of Pi?

• 5π feet

• 10π feet

• 2.5π feet

• 7.5π feet