Circle Vocab & Properties

Front

What is the diameter of a circle?

Back

The diameter is a straight line that passes through the center of the circle and connects two points on its boundary.

Front

What is the relationship of an internal angle with its arcs in a circle?

Back

An internal angle is equal to half the sum of the measures of the arcs that it intercepts.

Front

What is a sector in a circle?

Back

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

Front

What is the radius of a circle?

Back

The radius is a straight line from the center of the circle to any point on its boundary.

Front

What is the circumference of a circle?

Back

The circumference is the length of the boundary of a circle.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) can be calculated using the formula C = 2πr, where r is the radius.

Front

What is the area of a circle?

Back

The area of a circle is the space enclosed within its boundary, calculated using the formula A = πr².

Front

What is a chord in a circle?

Back

A chord is a straight line segment whose endpoints lie 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 tangent to a circle?

Back

A tangent is a straight line that touches the circle at exactly one point.