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The figure below shows a circle with center C, diameter RM, secants MÒ andMÀ, and tangent ON. Which of the angles must be right angles? Select afī thatapply.
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The figure below shows a circle with center C, diameter RM, secants MÒ andMÀ, and tangent ON. Which of the angles must be right angles? Select afī thatapply.

The figure below shows a circle with center C, diameter RM, secants MÒ andMÀ, and-example-1
User Mropp
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A tangent line is always at a right angle to the radius of the circle at the point of tangency, therefore:


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User Rikkles
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