Aug 05, 2014 · Cyclic quadrilaterals (or simply cyclic quads) are very important in Olympiad geometry. Almost every problem requires you to find a cyclic quad or two (or more) and use the obtained information. Many times I have been stuck on a problem, have said to myself “Can I find a cyclic quad?,” found one, and solved the problem soon after.

Given cyclic quadrilateral inside a circle, the task is to find the exterior angle of the cyclic quadrilateral when the opposite interior angle is given. Examples: Input: 48 Output: 48 degrees Input: 83 Output: 83 degrees Approach: Let, the exterior angle, angle CDE = x; and, it’s opposite interior angle is angle ABC; as, ADE is a straight line
Example showing supplementary opposite angles in inscribed quadrilateral. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. The exterior angle of a cyclic quadrilateral is equal to the interior opposite angle. A radius or diameter that is perpendicular to a chord divides the chord into two equal parts and vice versa. A tangent to a circle is perpendicular to the radius drawn to the point of tangency.

Aug 22, 2018 · If the side BC of ΔABC is produced to D, then ∠AÇD is called an exterior angle of ΔABC at C, while ∠BAC and ∠ABC are called its interior opposite angles. It is denoted by exterior ∠ACD. A quadrilateral ABCD is called a cyclic quadrilateral, if all the four vertices A B, C and D are concyclic, i.e. A, B, C and D lie on a circle. In Fig. 25.4, ABCD is a cyclic quadrilateral. The sum of opposite angles of a cyclic quadrilateral is always 80°, i.e. they are supplementary. Procedure

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