Circles Review

Front

What is a secant in a circle?

Back

A secant is a line that intersects a circle at two points.

Front

What is the central angle of a circle?

Back

The central angle is the angle whose vertex is at the center of the circle and whose sides are radii that extend to the circle.

Front

How do you find the measure of an arc in a circle?

Back

The measure of an arc can be found using the central angle that subtends the arc; it is equal to the measure of the central angle.

Front

What is a major arc?

Back

A major arc is an arc that is larger than a semicircle, measuring more than 180 degrees.

Front

What is a minor arc?

Back

A minor arc is an arc that is smaller than a semicircle, measuring less than 180 degrees.

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 relationship between the radius and diameter of a circle?

Back

The diameter d of a circle is twice the length of the radius r, so d = 2r.

Front

What is an inscribed angle?

Back

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

Front

How do you calculate the area of a circle?

Back

The area A of a circle is calculated using the formula A = πr^2, where r is the radius.

Front

What is the difference between a chord and a secant?

Back

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