# A Congruent Angle inside the Incircle

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

Let ABC be a triangle and let O be the center of the incircle. Let E be the point of tangency of the incircle with AC. Let AO and CO intersect the line drawn through the other two points of tangency at F and D, respectively. Then .

Contributed by: Jay Warendorff (March 2011)

After work by: Antonio Gutierrez

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

The statement of the theorem is in Problem 52. Triangle, Angles, Incircle.

## Permanent Citation

"A Congruent Angle inside the Incircle"

http://demonstrations.wolfram.com/ACongruentAngleInsideTheIncircle/

Wolfram Demonstrations Project

Published: March 7 2011