Circles- Radius, Diameter, Circumference, and Area

Front

What is the radius of a circle?

Back

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

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What is the formula for the area of a circle?

Back

Front

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

Back

The diameter is 10 cm, since diameter = 2 × radius.

Front

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

Back

The radius is 6 m, since radius = diameter / 2.

Front

What is the formula for the circumference of a circle using radius?

Back

Front

What is the formula for the circumference of a circle using diameter?

Back

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the radius.

Front

What is the area of a circle with a radius of 3 inches?

Back