Circle Measurements: Radius and Diameter

The video tutorial explains how to find the diameter and radius of a circle using simple formulas. It begins with an introduction to the concepts of diameter and radius, followed by a step-by-step guide to calculating the diameter when the radius is given. The tutorial then demonstrates how to find the radius when the diameter is provided. The video concludes with a recap of the formulas and methods discussed.

What is the formula to calculate the diameter if the radius is known?

• Diameter = Radius - 2

• Diameter = Radius / 2

• Diameter = Radius + 2

• Diameter = 2 x Radius

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

• 2 cm

• 8 cm

• 4 cm

• 6 cm

Which of the following is the correct calculation for a diameter when the radius is 4 cm?

• 2 x 4 = 12 cm

• 2 x 4 = 10 cm

• 2 x 4 = 8 cm

• 2 x 4 = 6 cm

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

• Radius = Diameter x 2

• Radius = Diameter / 2

• Radius = Diameter + 2

• Radius = Diameter - 2

If the diameter of a circle is 32 cm, what is the radius?

• 8 cm

• 20 cm

• 12 cm

• 16 cm