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In the given figure, l || m || n. ∠QPS = 35° and ∠QRT = 55°. Find ∠PQR. - Mathematics

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Question

In the given figure, l || m || n. ∠QPS = 35° and ∠QRT = 55°. Find ∠PQR.

Sum

Solution

We have,


l || m and PQ is a transversal

∴ ∠SPQ = ∠PQU  .....[Alternate interior angles]

⇒ ∠PQU = 35°  ......(i)

Also, m || n and QR is a transversal.

∴ ∠QRT = ∠RQU  ......[Alternate interior angles]

⇒ ∠RQU = 35°   ......(ii)

Now, ∠PQR = ∠PQU + ∠UQR

= 35° + 55°  ......[Using (i) and (ii)]

= 90°

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Chapter 5: Lines and Angles - Exercise [Page 141]

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NCERT Exemplar Mathematics [English] Class 7
Chapter 5 Lines and Angles
Exercise | Q 78. | Page 141

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