Exploring Circles: Radius, Diameter, Circumference, and Area

This video tutorial covers the fundamental concepts of circles, including definitions and calculations related to radius, diameter, circumference, and area. The lesson begins with an introduction to the objectives, followed by detailed explanations of key terms and relationships. Practical examples are provided to demonstrate how to calculate the area and circumference of a circle using both exact and approximate values of Pi. The tutorial concludes with a summary of the key points discussed.

What is the radius of a circle if its diameter is 24 inches?

• 12 inches

• 48 inches

• 6 inches

• 24 inches

If the diameter of a circle is 16 inches, what is its radius?

• 32 inches

• 16 inches

• 8 inches

• 4 inches

If the radius of a circle is 10 cm, what is the diameter?

• 5 cm

• 20 cm

• 10 cm

• 15 cm

What is the diameter of a circle if its radius is 15 meters?

• 20 meters

• 15 meters

• 30 meters

• 7.5 meters

Calculate the area of a circle with a radius of 7 cm using Pi.

• 14 Pi cm^2

• 21 Pi cm^2

• 49 Pi cm^2

• 28 Pi cm^2

Find the area of a circle with a radius of 3 meters using 3.14 for Pi.

• 28.26 m^2

• 12.56 m^2

• 9.42 m^2

• 18.84 m^2

What is the circumference of a circle with a diameter of 14 cm using 3.14 for Pi?

• 42.56 cm

• 44.96 cm

• 28.26 cm

• 38.78 cm

Calculate the circumference of a circle with a radius of 5 inches using 3.14 for Pi.

• 15.7 inches

• 10.7 inches

• 31.4 inches

• 20.2 inches

A frisbee has a circumference of 48 Pi cm. What is its radius?

• 24 cm

• 12 cm

• 48 cm

• 96 cm

Given the circumference of a circle is 100 Pi cm, find its diameter.

• 50 cm

• 100 cm

• 200 cm

• 25 cm