Parallel-line angles

<p style="text-align: center">The sum of all angles at a point is $360{}^\circ $.<br><br>(Angles at a point)</p>
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<p style="text-align: center">$a{}^\circ +b{}^\circ +c{}^\circ +d{}^\circ =360{}^\circ $ </p>

The sum of all angles at a point is $360{}^\circ $.

(Angles at a point)

$a{}^\circ +b{}^\circ +c{}^\circ +d{}^\circ =360{}^\circ $ 

Angles at a Point

Angles at a Point

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