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Question

In the given figure, if AB || CD || EF,
PQ || RS, RQD=25° and CQP=60°, then find QRS .

A
130°
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B
135°
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C
140°
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D
145°
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Solution

The correct option is D 145°
Given AB || CD, RQ is the transversal.
RQD=ARQ=25° (Alternate interior angles)

Given PQ||RS, RQ is the transversal.
Then, SRB=PQC=60° (Alternate exterior angles).

ARS+SRB=180° (Linear pair)
ARS+60°=180°
ARS=120°

QRS=ARS+ARQ
QRS=120°+25°=145°

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