Arcs and Angles Circles

Front

What is an arc in a circle?

Back

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

Front

What is the measure of a central angle?

Back

The measure of a central angle is equal to the measure of the arc it intercepts.

Front

Define a chord in a circle.

Back

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

Front

What is a diameter?

Back

A diameter is a chord that passes through the center of the circle and is the longest chord.

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 relationship between a tangent and a radius?

Back

A tangent is perpendicular to the radius at the point of contact.

Front

How do you calculate the circumference of a circle?

Back

Circumference = π × diameter.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

What is the measure of a semicircle?

Back

The measure of a semicircle is 180 degrees.

Front

What is the difference between a secant and a chord?

Back

A secant is a line that intersects the circle at two points, while a chord is a segment between two points on the circle.