Mathematics for IGCSE & O level - Circle Theorems (Section 3 - No. 2)
If two chords of a circle intersect at right angles, what can we conclude about the arcs they intercept?
The arcs are equal.
The arcs are complementary.
The arcs are supplementary.
The arcs are unrelated.
Explication
The arcs intercepted are complementary as the angles are at right angles.