10.1 Circles Vocabulary Review

Front

What is the diameter of a circle?

Back

The diameter is the longest distance across the circle, passing through the center. It is twice the length of the radius.

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

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 secant line?

Back

A secant line is a line that intersects a circle at two points.

Front

What is a tangent line?

Back

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

Front

How do you calculate the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (Diameter = 2 × Radius).

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

What is the measure of a tangent line from a point outside the circle?

Back

The length of the tangent line is equal to the square root of the difference between the square of the distance from the point to the center and the square of the radius.

Front

What is the central angle of a circle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides are radii.