Circle Basics and Arc Length

Front

What is a circle?

Back

A circle is a shape consisting of all points in a plane that are at a given distance from a fixed point, called the center.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle, calculated as C = 2πr, where r is the radius.

Front

What is a radius?

Back

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

Front

What is a diameter?

Back

A 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

What is an arc?

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

The length of an arc can be calculated using the formula: Length = (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).

Front

What is a chord?

Back

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