# Calculation of the inner circle of a triangle

The following interactive smartphone app shows how the inner circle of a triangle is calculated geometrically.

The vertices of the triangle can be moved interactively with the mouse (or the finger on a touchscreen).

Start App

The app has been specifically designed for mobile phones and tablets. The layout of the app can adapt to different display formats. The app can also be played on a normal PC or Macintosh.

Title: | Calculation of the inner circle of a triangle |

Target group: | Students |

Level: | easy |

Platforms (primary): | Smartphones, tablets and PCs |

Online/Offline: | Internet connection is required. |

## Further animations for smartphones / tablets

Calculation of the outer circle at the triangle

Calculation of the center of gravity of a triangle

Geometric relationships at the quadrangle

Basic principles of differential and integral calculus

## Advanced animations for PCs

Geometric relations on the triangle

Basic principles of differential and integral calculus

Pythagorean theorem

Sine and cosine theorem

Basis of the integral calculus

## Sources

- Authoring tool: Adobe Animate
- JavaScript library: CreateJS

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## Feedback

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