circumference of a circle

Front

What is the center of a circle?

Back

The center is the point that is equidistant from all points on the circle.

Front

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

Back

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

Front

If the diameter of a circle is 3 cm, what is the radius?

Back

The radius is 1.5 cm.

Front

What is the circumference of a circle with a radius of 5 inches?

Back

31.4 inches.

Front

What does the term 'diameter' refer to in a circle?

Back

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

Front

How do you find the circumference if you only know the radius?

Back

Use the formula: Circumference = 2 × π × radius.

Front

What is π (pi) approximately equal to?

Back

π is approximately equal to 3.14.

Front

If a circle has a circumference of 37.68 cm, what is its diameter?

Back

The diameter is approximately 12 cm.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.