Review of Circles

Front

What is 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 formula for the circumference of a circle?

Back

The circumference C of a circle is given by the formula C = 2πr, where r is the radius.

Front

What is the formula for the area of a circle?

Back

The area A of a circle is given by the formula A = πr², where r is the radius.

Front

What is a radius?

Back

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

Front

What is a diameter?

Back

A diameter is a line segment that passes through the center of the circle and has its endpoints on the circle. It is twice the length of the radius.

Front

What is a chord?

Back

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

Front

What is a tangent?

Back

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

Front

What is a secant?

Back

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

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.