Check whether L is parallel to m in each of the following figures. Give reasons for your answer
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Ways to check If l║m
If corresponding angles are equal, l║m.
If co-interior angles are equal, l║m.
If alternate interior angles are equal, l║m.
If any one condition is obeyed, we can tell the lines are parallel.
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First lets find angles that are able to be found.
∠PQS + 60° = 180° (Linear pair)
∠PQS = 180° - 60°
∠PQS = 120°
Now, we can see that corresponding angles PQS and PQM are equal,
Since corresponding angles are equal the lines are parallel!
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Assume that ∠abc=120
&∠bde=60
∠bde+∠bdf=180 (linear pair of angles)
60+∠bdf=180
∠bdf=120
∴∠bdf=∠abc (corresponding angles)