Parts 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 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 the center, equal to twice the radius.

Front

How do you calculate the radius from the diameter?

Back

Front

If the diameter of a circle is 10 mm, what is the radius?

Back

The radius is 5 mm.

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

What is the circumference of a circle?

Back

Front

What is the area of a circle?

Back

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.