Rectangle

Show that, for any values of x and y where x>y,
the angle SPQ is always the same and find this angle
the angle SRQ is always the same and find this angle
the quadrilateral SPQR is cyclic
the angle PQR is always the same and find this angle
the angle PSR is always the same and find this angle.
Source: Nrich.maths.org
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Cyclic Quadrilateral