Mathematics for IGCSE & O level - Circle Theorems (Section 1 - No. 17)
Which of the following is NOT a property of cyclic quadrilaterals?
Opposite angles are supplementary.
The sum of interior angles is 360°.
All four vertices lie on the circumference.
All sides are equal.
Εξήγηση
Not all sides of a cyclic quadrilateral are equal.