Circles: Arcs, Angles, and Vocabulary

Front

What is a chord in a circle?

Back

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

Front

What is the point of tangency?

Back

The point of tangency is the point at which a tangent line intersects the circle.

Front

What is a semi-circle?

Back

A semi-circle is half of a circle, formed by a diameter and the arc connecting its endpoints.

Front

What is a minor arc?

Back

A minor arc is an arc that is smaller than a semi-circle.

Front

What is a major arc?

Back

A major arc is an arc that is larger than a semi-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 given point called the center.

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the length of the radius.

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 an inscribed angle?

Back

An inscribed angle is an angle formed by two chords in a circle that share an endpoint.