Radius and Diameter

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, and is twice the length of the radius.

Front

If the diameter of a circle is 40 ft, what is the radius?

Back

20 ft

Front

What is the formula to find the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

What does 'circumference' mean?

Back

Circumference is the distance around a circle.

Front

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2.

Front

If the radius of a circle is 6 ft, what is the diameter?

Back

12 ft

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, used in calculations involving circles.

Front

If the radius of a circle is 10 m, what is the circumference?

Back

Circumference = 2 × π × 10 m ≈ 62.8 m.