Geometry Circles Review

Front

What is the definition of 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 formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.

Front

What is the formula for the area of a circle?

Back

A = πr², where r is the radius.

Front

What is a radius in a circle?

Back

A radius is a line segment from the center of the circle to any point on the circle.

Front

What is a diameter in a circle?

Back

A diameter is a line segment that passes through the center of the circle and has its endpoints on the circle.

Front

What is an arc in a circle?

Back

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

Front

What is a minor arc?

Back

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

Front

What is a major arc?

Back

A major arc is an arc that is larger than a semicircle.

Front

How do you calculate the length of an arc?

Back

Length of arc = (θ/360) × C, where θ is the angle in degrees and C is the circumference.

Front

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

Back

The arc length is directly proportional to the central angle.