Mathematics for IGCSE & O level - Circle Theorems (Section 2 - No. 47)
In a cyclic quadrilateral, if one of the angles is 70 degrees, what is the measure of the opposite angle?
70 degrees
90 degrees
110 degrees
140 degrees
Giải thích
Opposite angles of a cyclic quadrilateral are supplementary, so 180 - 70 = 110 degrees.