Intro to Circles Test

Front

What is a circle?

Back

A circle is a set of points in a plane that are equidistant from a fixed point called the center.

Front

What is the diameter of a circle?

Back

The diameter is a line segment that passes through the center of the circle and has its endpoints on the circle. It is twice the length of the radius.

Front

Define the radius of a circle.

Back

The radius is the distance from the center of the circle to any point on the circle.

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 circumference of a circle?

Back

The circumference C of a circle can be calculated using 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 a chord in a circle?

Back

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

Front

What is a central angle?

Back

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

Front

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

Back

The length of an arc is directly proportional to the measure of the central angle that subtends it.

Front

How do you find the measure of an arc?

Back

The measure of an arc can be found using the formula: Arc Measure = (Central Angle/360) * Circumference.