### Concept (1)

When a radius is drawn to a point of tangency, the angle formed is always a right (90 degree) angle. This fact is commonly applied in problems with two tangent segments drawn to a circle from a point. If two radii to tangents are drawn in, a kite with two right angles is formed and the missing angles or sides can be found. Related topics include central angles, tangent segments to a circle, and chords.

### Sample Problems (3)

Need help with "Radii to Tangents" problems? Watch expert teachers solve similar problems to develop your skills.

###### Problem 1
How to calculate the central angle formed by radii to tangents that intersect at a point outside the circle.
###### Problem 2
How to calculate the measure of a missing angle in a quadrilateral formed by two circles that are tangent but not congruent and their radii drawn to a common line of tangency.
###### Problem 3
How to calculate the length of a segment drawn from the center of a circle to a point outside the circle, given the length of the tangent segment to that circle.