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Incircle, Excircles, and the 9-Point Circle

Author:
Steve Phelps
Topic:
Circle, Circumcircle or Circumscribed Circle, Incircle or Inscribed Circle, Triangles

There are four circles tangent to three sides of a triangle...

And one circle tangent to all four circles.

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  • Area of a Circle
  • A2_6.02 Evaluating trigonometric functions_1
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  • Poorly Drawn Squares

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  • When Secants Intersect at a Point Outside a Circle
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  • Quadrilaterals
  • Linear Regression
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