There are two theorems involving tangents. The angle between a tangent and a radius is 90°.. Angle OCA and OBA are both 90°. OB = OC because they are both radii of the circle. A straight line ...
When calculating angles using a circle theorem, always state which ... A tangent to a circle is perpendicular to the radius which meets the tangent. which meet at the same point are the same ...
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