Diameter and Radius Relationships

The video tutorial explains how to find the diameter and radius of a circle using simple formulas. It begins by introducing the formula for diameter, which is twice the radius, and demonstrates this with an example where the radius is 4 cm, resulting in a diameter of 8 cm. The tutorial then shifts to finding the radius from a given diameter, using the formula that divides the diameter by 2. An example is provided where a diameter of 32 cm results in a radius of 16 cm. The video concludes with a recap of the formulas and ensures the student understands the concepts.

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

• Diameter = Radius + 2

• Diameter = Radius - 2

• Diameter = 2 x Radius

• Diameter = Radius / 2

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

• 8 cm

• 2 cm

• 4 cm

• 6 cm

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

• Radius = Diameter - 2

• Radius = Diameter + 2

• Radius = Diameter / 2

• Radius = Diameter x 2

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

• 20 cm

• 8 cm

• 12 cm

• 16 cm

Which of the following is true about the relationship between diameter and radius?

• The diameter is twice the radius.

• The radius is twice the diameter.

• The diameter is half the radius.

• The radius is equal to the diameter.