The diagram shows two straight lines, $AB$ and $CD$, intersecting at $O$. \(\angle DOB=39{}^\c

Question

The diagram shows two straight lines, $AB$ and $CD$, intersecting at $O$. $\angle DOB=39{}^\circ $ and $\angle COE=81{}^\circ $. Find $\angle AOC$, the value of $x$, stating your reason clearly.

Accepted Answer

(a)$\angle AOC=39{}^\circ $ (vertically opposite angles) (b) $x=20$

Solving Unknown Angles in Intersecting Lines

Solving Unknown Angles in Intersecting Lines

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