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If a line is tangent to a circle, then the line is perpendicular to the radius at the point of tangency.
130
To find the measure of ∠ YOZ, we will use the fact that the sum of the measures of interior angles in a quadrilateral is 360^(∘). m∠ YOZ+ 90+ 90+ 50=360 ⇕ m∠ YOZ=130
