This theorem dictates that vertically orientated, alternate interior angles of two rays intersecting will always be equal. This is because each of the two lines creates a line segment where both ...

This theorem dictates that vertically orientated, alternate interior angles of two rays intersecting will always be equal. This is because each of the two lines creates a line segment where both ...

A straight line joining two points on a circle is known as a chord. The angle between a tangent and a chord is equal to the angle in the alternate segment.

When calculating angles using a circle theorem, always state which theorem applies. It may not be possible to calculate the missing angle immediately. It may be necessary to calculate another ...