Unit 7 Circles Practice Flashcard

Front

What is a degree in terms of angles?

Back

A degree is a unit of measurement for angles, where a full circle is 360 degrees.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle, calculated as C = 2πr, where r is the radius.

Front

What is the relationship between the central angle and the arc length?

Back

The arc length is directly proportional to the central angle; as the angle increases, the arc length increases.

Front

What is the formula for the area of a circle?

Back

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

Front

What is an inscribed angle?

Back

An inscribed angle is formed by two chords in a circle which have a common endpoint.

Front

What is the measure of an inscribed angle in relation to its intercepted arc?

Back

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

Front

What is the relationship between the angles formed by two intersecting chords?

Back

The measure of the angle formed by two intersecting chords is equal to the average of the measures of the arcs intercepted by the angle and its vertical angle.

Front

What is the definition of a tangent to a circle?

Back

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

Front

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

Back

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

Front

What is the formula for the length of an arc?

Back

The length of an arc is given by L = (θ/360) * 2πr, where θ is the central angle in degrees.