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Given PQRS is Parallelogram

Each diagonal bisects the Parallelogram into two congruent triangles

And pair of opposite angles is equal

⇒∠PQR = PSR = 55°

In ΔPSR

PSR = 55°, SRP = 70°(given)

RPS = 180° - (70° + 55°) = 180°- 125° = 55°(angle sum property of a triangle)
Now, PS
QR and PR is transversal

So SPR = PRQ = 125° (alternate angles are equal on the transversal)

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