in the diagram PQ and PS are tangents drawn to circle O, and the chord QS is drawn. If the measure of angle P=40, what is the measure of angle PQS
If the measure of m∠P = 40°, the measure of m∠PQS is 70 degrees.
A tangent to a circle is a straight line which touches the circle at only one point.
The length of tangent PQ and PS are equal. Therefore, triangle PQS is an isosceles traingle.
Hence, the base of the isosceles triangle are equal. Therefore,
let
m∠PQS = x
m∠PSQ = x
40 + 2x = 180
2x = 180 - 40
2x = 140
x = 140 / 2
x = 70 degrees
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