Cyclic Quadrilateral - GCSE Maths Definition

A cyclic quadrilateral is a four-sided shape where all its corners, called vertices, sit on the edge of a circle. This circle is known as the "circumcircle." In a cyclic quadrilateral, one important thing to remember is that the sum of the opposite angles always adds up to 180 degrees. This means if you add the measure of two opposite angles together, they will equal 180 degrees. Learning about cyclic quadrilaterals is helpful in understanding more about geometry and how shapes work within circles.