Radius Diameter

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

• Diameter

• Circumference

• Radius

• Chord

A straight line segment that passes through the center of a circle and whose endpoints lie on the circumference of the circle is called the ____.

• Radius

• Circumference

• Diameter

• Chord

If the radius of a circle is doubled, what happens to the diameter?

• It triples.

• It remains the same.

• It also doubles.

• It halves.

What is the relationship between radius and diameter?

• Diameter is equal to the radius.

• Diameter is half the radius.

• Diameter is twice the radius.

• Diameter is three times the radius.

If the diameter of a circle is 100 m, what is the radius?

• 25 m

• 50 m

• 75 m

• 100 m

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

• 15 cm

• 20 cm

• 25 cm

• 30 cm

What is the diameter of a circle with a radius of 40 ft?

• 60 ft

• 70 ft

• 80 ft

• 90 ft

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

• 8 cm

• 10 cm

• 12 cm

• 6 cm

The circumference of a circle can be calculated using the formula ____ = π × diameter.

• Area

• Circumference

• Radius

• Diameter

The area of a circle is calculated using the formula ____ = π × radius².

• Circumference

• Diameter

• Area

• Perimeter