In a circle with centre P, S is the midpoint of chord QR. Write the measure of ∠PSQ. Give reason.
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Step-by-step explanation:
It is given that line AB is tangent to the circle at A.
∴ ∠CAB = 90º (Tangent at any point of a circle is perpendicular to the radius throught the point of contact)
Thus, the measure of ∠CAB is 90º.
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