Monash University

The unit circle

In the study of circular functions, the unit circle plays a central role in linking angles with trigonometric values. By defining sine, cosine, and tangent in terms of coordinates on a circle of ...
BBC

Angles around a point

A full turn around a point equals 360º. If a full turn equals 360º, then the sum of the angles around a point must also be 360º. When you calculate angles around a point, you can use this fact to find ...
BBC

Angles in a semicircle - Higher

The angle at the circumference in a semi-circle is 90°. Angle STU = 90° Angles in a triangle add up to 180°. The angle on a straight line is 180°. The angle VOY = 180°. The angle at the centre is ...
IEEE

Design Method for High-Order Sigma–Delta Modulator Stabilized by Departure Angles Designed to Keep Root Loci in Unit Circle

Abstract: In this brief, a systematic method to design stable single-stage high-order sigma–delta modulators (SDMs) without the need of stability-recovery mechanisms is proposed. It is shown that if ...