Exploring the Circumference of a Circle

This video tutorial covers the basics of circles, focusing on the parts of a circle, such as radius, diameter, and chord. It explains the concept of circumference and its relationship with diameter, using practical examples. The tutorial also introduces formulas for calculating circumference using both diameter and radius, and provides practice problems to reinforce learning.

What term is used specifically for the perimeter of a circle?

• Diameter

• Radius

• Circumference

• Area

Which part of the circle is defined as the distance from the center to the edge?

• Circumference

• Chord

• Diameter

• Radius

What is the diameter of a circle if the radius is known to be 5 units?

• 15 units

• 2.5 units

• 10 units

• 5 units

What constant value approximately represents the ratio of a circle's circumference to its diameter?

• 5.14

• 3.14

• 2.14

• 4.14

In the tire example, what was the common ratio found when dividing the circumference by the diameter?

• 3.14

• 2.14

• 3.00

• 3.50

How is the circumference of a circle calculated using the radius?

• C = 2r

• C = 2πr

• C = πd

• C = πr²

What is the formula to find the circumference if the diameter is known?

• C = πr²

• C = 2r

• C = πd

• C = 2πr

If the radius of a circle is 7 meters, what is the circumference in terms of π?

• 21π meters

• 7π meters

• 14π meters

• 28π meters

What is the approximate numerical value of π used in calculations?

• 3.50

• 4.00

• 3.14

• 3.00

If a Ferris wheel has a diameter of 40 meters, what is its circumference?

• 80π meters

• 40π meters

• 120π meters

• 160π meters