Study the diagram of circle A, where BC⎯⎯⎯⎯⎯⎯⎯⎯ is tangent to circle A at point C. Also, BC=3, BA=5, and AC⎯⎯⎯⎯⎯⎯⎯⎯ is a radius.
What is the length of the radius, r?

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

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