More Lessons for High School Regents Exam

Math Worksheets

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

Angles in Semicircles

An angle is inscribed in a semicircle is 90° because it will be half the measure of a semicircle (180 degrees). Angles in semicircle is one way of finding missing missing angles and lengths. Pythagorean's theorem can be used to find missing lengths (remember that the diameter is the hypotenuse).

Chords to Tangents

The measure of an angle formed by a chord to a tangent is half the intercepted arc.

Arcs, semicircles, and central angles

Central Angle

A central angle C of a circle has its vertex at the center C of the circle. It separates the circle into two arcs: the minor arc and the major arc.

How to find the measure of an arc formed by the intersection of a chord and a tangent line in a circle.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.