Circles -- Geometry Spring 2024

Front

What is a radius of a circle?

Back

A radius is a line segment that connects the center of the circle to any point on its circumference.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is calculated using the formula C = 2πr, where r is the radius.

Front

How do you find the area of a circle?

Back

The area (A) of a circle is calculated using the formula A = πr², where r is the radius.

Front

What is the diameter of a circle?

Back

The diameter is a line segment that passes through the center of the circle and connects two points on its circumference. It is twice the length of the radius.

Front

What is an arc in a circle?

Back

An arc is a portion of the circumference of a 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 a sector of a circle?

Back

A sector is a region enclosed by two radii and the arc between them.

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

How do you calculate the length of an arc?

Back

The length of an arc can be calculated using the formula L = (θ/360) × C, where θ is the central angle in degrees and C is the circumference.

Front

What is the relationship between the radius and diameter?

Back

The diameter is twice the length of the radius (d = 2r).