Radius, Diameter, and Circumference of circles

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, passing through the center. It is twice the length of the radius.

Front

How do you calculate the circumference of a circle?

Back

Circumference can be calculated using the formula: Circumference = π × diameter or Circumference = 2 × π × radius.

Front

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

Back

10 ft

Front

If the diameter of a circle is 30 cm, what is the radius?

Back

15 cm

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

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

Back

31.4 cm

Front

If a circular pool has a radius of 7 ft, what is its circumference?

Back

43.96 ft

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the radius.

Front

If the circumference of a circle is 62.8 cm, what is the diameter?

Back

20 cm