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Tangent circles

2:09

Given a line tangent to a circle find the value of x

2:34

Example with tangent and radius | Circles | Geometry | Khan Academy

3:02

Tangents to unequal circles

1:48

Constructing a Tangent to a Circle

3:24

Find the equation of a circle given the center and line tangent to the circle

In geometry, tangent circles are circles in a common plane that intersect in a single point. There are two types of tangency: internal and external. Many problems and constructions in geometry are related to tangent circles; such problems often have real-life applications such as trilateration and maximizing the use of materials.
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    • Malfatti's problem 

    • Generalizations