Question

In fig, if PQIIST, ZPQR = 110°and ZRST = 130°, Find ZQRS.
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Answer 1

let make a AB line which are parallel to ray ST

when to lines are parallel than ther interior angles are suplimentry angle there for its measure is 180°

therefore angle rst+angle brs =180

therefore angle brs = 45°

and

angle pqr + qra =180

therefore qra = 70°

and

angle qra + srb + qrs =180

therefore angle srb = 180-115

= 65°