Question

in the figure,if PQ || RS , then find c in terms of a and b .​

Answer 1

Answer:

In figure given PQ∣∣RS and ∠PQS=600 and ∠QEF=300

The PQ∣∣RS and line QSE meet it  then 

∠PQS=∠RSE=600

The line QSE is a straight line then

∠QSR+∠RSE=1800

⇒∠QSR+600=1800

⇒QSR=1200