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Circle Theorems Exam Questions In the diagram below points Q and S lie on a circle centre O. SR is a tangent to the circle at S. Angle QRS = 40° and angle SOQ = 80° Prove that triangle QSR is isosceles. ____________________________________________________________________ A, B and C are points on the circumference of a circle with centre O. BD and CD are tangents. Angle BDC = 40° (i) Work out the value of p. (ii) Hence write down the value of q. _____________________________________________________________________  The tange