Circles REVIEW

Front

What is the standard equation of a circle?

Back

The standard equation of a circle with center (h, k) and radius r is (x - h)² + (y - k)² = r².

Front

What does the center of a circle represent?

Back

The center of a circle is the point that is equidistant from all points on the circle.

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 relationship between the angles formed by two intersecting chords?

Back

The measure of the angle formed by two intersecting chords is equal to half the sum of the measures of the arcs intercepted by the angle.

Front

What is a minor arc?

Back

A minor arc is an arc that is smaller than a semicircle.

Front

How do you find the measure of an angle formed by two tangents to a circle?

Back

The measure of the angle formed by two tangents to a circle from a point outside the circle is equal to half the difference of the measures of the intercepted arcs.

Front

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

Back

The diameter of a circle 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 the measure of a semicircle?

Back

The measure of a semicircle is 180 degrees.