Answer:
The opposite angles of an inscribed quadrilateral are supplementary to each other or sum to 180 degrees.
Step-by-step explanation:
An inscribed quadrilateral is a 4-sided polygon where all four vertices lie on the circumference of a circle.
One of the properties of an inscribed quadrilateral is that its opposite angles are supplementary, which means they add up to 180°.
This can be proved by the Inscribed Angle Theorem, that states that an angle inscribed in a circle is half the measure of the central angle that subtends the same arc. (See attachment).
