Circle vocabulary

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 center of a circle?

Back

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

Front

What is a radius in a circle?

Back

A radius is a line segment from the center of the circle to any point on its circumference.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

How do you calculate the circumference of a circle?

Back

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

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.

Front

What is a tangent to a circle?

Back

A tangent is a line that touches the circle at exactly one point.

Front

What is a secant line?

Back

A secant line is a line that intersects the circle at two points.

Front

What is an arc in a circle?

Back

An arc is a part of the circumference of a circle.