The area and circumference of circles

The history of circles

Segments and lengths associated with tangents, chords, and secants

Central angles and inscribed angles

They are perpendicular

They are parallel

They are congruent

They are unequal

The tangents are equal in length

The tangents are perpendicular

The tangents form a right angle

The tangents are parallel

Divide the lengths of the tangents

Subtract the lengths of the tangents

Multiply the lengths of the tangents

Add the lengths of the tangents

2

4

6

8

The difference of the segments

The product of the segments of the other chord

The sum of the segments

The square of the segments

Outside times the whole equals the product of the other secant

The sum of the segments equals the product of the tangent

Outside times the whole equals the square of the tangent

The difference of the segments equals the product of the tangent

The entire secant segment

The external segment of the secant

The internal segment of the secant

The tangent segment

It is halved

It is squared

It is doubled

It is tripled

The secant is double the tangent

The product of the secant's lengths equals the square of the tangent

The secant is half the tangent

The secant is equal to the tangent