High School Math based on the topics required for the Regents Exam conducted by NYSED.

Angles in a Circle

This episode deals with angles formed with vertices outside the circle.

Learn how two types of secants form angles.

Learn how to solve problems for secants and arcs.

A secant is a line, ray, or line segment that intersects a circle in two places.

Three points are covered:

(1) secants that intersect in a circle which divide each other proportionally,

(2) the angle formed by secants which intersects in a circle and is half the sum of the intercepted arcs,

and (3) two secants drawn from the same point outside a circle that form an angle whose measure is half the difference of the intercepted arcs.

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