PARTS OF A 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 a straight line that passes through the center of the circle, connecting two points on its circumference. It is twice the length of the radius.

Front

What is the circumference of a circle?

Back

The circumference is the total distance around the circle.

Front

What is a central angle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides are radii that extend to the circumference.

Front

What is a tangent line?

Back

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

Front

What is a secant line?

Back

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

Front

What is a chord?

Back

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

Front

What is an arc?

Back

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

Front

What is a major arc?

Back

A major arc is an arc that is larger than a semicircle.

Front

What is a minor arc?

Back

A minor arc is an arc that is smaller than a semicircle.