JAMB 1995 · UME · Q26

Angles in triangle $ABC$ add up to $180^\circ$: $\angle ABC = 180^\circ - 81^\circ - 53^\circ$

$ABCD$ is a cyclic quadrilateral, and $B$ and $D$ are opposite vertices.

Opposite angles of a cyclic quadrilateral add up to $180^\circ$: $x = 180^\circ - 46^\circ = 134^\circ$, option A.