Circles Circles Circles

Front

What is the definition of a circle?

Back

A circle is a shape consisting of all points in a plane that are a fixed distance from a center point.

Front

What is the diameter of a circle?

Back

The diameter is a line segment that passes through the center of the circle and touches both edges.

Front

What is the relationship between the radius and diameter?

Back

The diameter is twice the length of the radius.

Front

What does the symbol π represent?

Back

π (pi) represents the ratio of the circumference of a circle to its diameter, approximately equal to 3.14.

Front

How do you calculate the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

What is the area of a circle?

Back

Area = 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 tangent to a circle?

Back

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

Front

What is the center of a circle?

Back

The center is the point that is equidistant from all points on the circle.

Front

What is a sector of a circle?

Back

A sector is a portion of a circle enclosed by two radii and the arc between them.