Parts of a Circle

Front

What is the definition of a circle?

Back

A circle is a set of points in a plane that are equidistant from a fixed point called the center.

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through the center, and it is twice the length of the radius.

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 the circle.

Front

What is the relationship between the radius and diameter?

Back

The diameter is twice the length of the radius.

Front

What is the center of a circle?

Back

The center is the fixed point from which all points on the circle are equidistant.

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 secant line?

Back

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

Front

What is a tangent line?

Back

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

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

How do you calculate the circumference of a circle?

Back

The circumference can be calculated using the formula C = πd or C = 2πr, where d is the diameter and r is the radius.