10.1 Circle Review

Front

What is the radius of a circle?

Back

The measurement from the center of a circle to an edge of the circle.

Front

What is a tangent line of a circle?

Back

A line that touches the circle only once.

Front

What can be concluded if two tangents of a circle meet outside of the circle at one point?

Back

The tangents are congruent.

Front

If AB and AC are segments from a point outside a circle to points on the circle, what can be concluded if they are equal?

Back

AB = AC.

Front

What is the diameter of a circle?

Back

The measurement across the circle through the center, equal to twice the radius.

Front

What is the circumference of a circle?

Back

The distance around the circle.

Front

What is the relationship between the radius and diameter?

Back

The diameter is twice the radius.

Front

What is a chord in a circle?

Back

A line segment whose endpoints lie on the circle.

Front

What is the area of a circle?

Back

A = πr², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.