Question
Using only a ruler, draw an acute angle, an obtuse angle and a straight angle.
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Answer
$i.\ \angle\text{AOB}$ is an acute angle.
$ii.\ \angle\text{POQ}$ is an obtuse angle.
$iii.\ \angle\text{XOY}=180^\circ$ = a straight angle.
$ii.\ \angle\text{POQ}$ is an obtuse angle.
$iii.\ \angle\text{XOY}=180^\circ$ = a straight angle.
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