Radius and Diameter

Front

A straight line from the center of a circle to the circumference is called the ____.

Back

Radius

Front

The longest straight line that can be drawn through a circle, connecting two points on its circumference is called the ____.

Back

Diameter

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the length of the radius.

Front

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

Back

10 cm

Front

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

Back

6 cm

Front

What is the formula to calculate the circumference of a circle using the diameter?

Back

Circumference = π × Diameter

Front

What is the formula to calculate the circumference of a circle using the radius?

Back

Circumference = 2 × π × Radius

Front

If a circle has a radius of 3 cm, what is its area?

Back

Area = π × (Radius)² = 28.27 cm² (approximately)

Front

What is the area of a circle with a diameter of 10 cm?

Back

Area = π × (5 cm)² = 78.54 cm² (approximately)

Front

True or False: The radius can be longer than the diameter.

Back

False