Radius and Diameter Relationship

What is the definition of radius?

• The radius is the length of the circumference of a circle.

• The radius is the area enclosed by a circle.

• The radius is the diameter of a circle.

• The radius of a circle is the distance from the center of the circle to any point on its circumference.

How can you calculate the radius if you know the diameter?

• radius = diameter + 2

• radius = diameter / 2

• radius = diameter * 2

• radius = diameter - 2

If the radius of a circle is 5 cm, what is its diameter?

• 15 cm

• 10 cm

• 20 cm

• 25 cm

Explain the relationship between radius and diameter.

• The radius is always greater than the diameter.

• The relationship between radius and diameter is that the diameter is always twice the length of the radius.

• The diameter is always half the length of the radius.

• The radius and diameter are equal in length.

What is the formula to find the diameter from the radius?

• Diameter = Radius / 2

• Diameter = Radius ^ 2

• Diameter = Radius + Radius

• Diameter = 2 * Radius

Give an example of a real-life object where radius and diameter are used.

• Bicycle wheel

• Coffee mug

• Soccer ball

• Traffic cone

If the diameter of a circle is 12 cm, what is its radius?

• 4 cm

• 6 cm

• 10 cm

• 8 cm

Why is the diameter of a circle always twice the length of its radius?

• The diameter is always three times the length of its radius

• The diameter is always equal to the length of its radius

• The diameter of a circle is always twice the length of its radius.

• The diameter is always half the length of its radius

Calculate the radius of a circle with a diameter of 20 cm.

• 10 cm

• 15 cm

• 5 cm

• 25 cm

Provide a real-life scenario where understanding the relationship between radius and diameter is important.

• Planning a road trip

• Designing circular structures in engineering.

• Solving algebraic equations

• Baking cookies