Angles in a Circle Rules
Find the measure of the missing angles x and y in the diagram below. Circles have different angle properties described by different circle theorems. Circle Theorems Maths Revision Gcse Maths Revision Gcse Math Circle Theorems The angle formed by the intersection of 2 tangents 2 secants or 1 tangent and 1 secant outside the circle equals half the difference of the intercepted arcs. . Two tangents are the same length if they come from the same point. Angles in circles can be constructed via the radii tangents and chords. A chord is a straight line segment that has endpoints on the circumference of the circle and an inscribed angle is formed by two chords. Using the circle theorem The angle subtended by the diameter at the. Length of chord 2 r 2 d 2 Segment. There are specific rules for finding angle and arc measures depending on where the angles are drawn. An exterior angle has its vertex where two rays shar...