Circle Geometry Flashcard

Front

What is a circle?

Back

A set of all points in a plane equidistant from a fixed point.

Front

What is the formula for the circumference of a circle in terms of the radius?

Back

C = 2πr.

Front

What is the radius of a circle?

Back

A line segment joining the center of the circle to a point on it.

Front

How is the diameter related to the radius?

Back

Diameter is twice the radius.

Front

What is the center of a circle?

Back

The point equidistant from all points on the circle.

Front

What is the formula for the area of a circle?

Back

A = πr².

Front

What is a chord in a circle?

Back

A line segment with both endpoints on the circle.

Front

What is a tangent to a circle?

Back

A line that touches the circle at exactly one point.

Front

What is a secant line?

Back

A line that intersects the circle at two points.

Front

What is an arc in a circle?

Back

A part of the circumference of a circle.