Geometry- Circles

Front

What is a tangent line to a circle?

Back

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

Front

What is the relationship between a radius and a tangent line at the point of tangency?

Back

The radius drawn to the point of tangency is perpendicular to the tangent line.

Front

Define a chord in a circle.

Back

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

Front

What is the measure of a full circle in degrees?

Back

A full circle measures 360 degrees.

Front

What is an arc in a circle?

Back

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

Front

How do you calculate the length of an arc?

Back

The length of an arc can be calculated using the formula: (θ/360) * 2πr, where θ is the central angle in degrees and r is the radius.

Front

What is the central angle of a circle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides intersect the circle.

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 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 the relationship between the inscribed angle and the intercepted arc?

Back

The measure of an inscribed angle is half the measure of its intercepted arc.