Triangle Review
Triangle Types
![Triangle Types](https://beta.geogebra.org/resource/rgvt7swk/ktuykrAZqgrWC3FI/material-rgvt7swk.png)
Use the interactive animation below to manipulate vertex "C". Try to form the 6 triangle types from above.
Interior Angles of a Triangle
Recall that the interior (inside) angles of a triangle add up 180. Manipulate the triangle below to verify.
Summary
![Summary](https://beta.geogebra.org/resource/f7dhmnbn/tzk3j2Y5F2DEVsiW/material-f7dhmnbn.png)
Exterior Angles of a Triangle.
There are two exterior (outside) angle relationships to consider for triangles. For the first relationship, the exterior angles of a triangle all add up to 360.
![Image](https://beta.geogebra.org/resource/kjnt38fj/R5znBWfW8FsB3G0n/material-kjnt38fj.png)
In the second relationship, an exterior angle equals the sum of the two opposite interior angles. Use the animation below to illustrate. In the animation below, drag Point A (or BAC) to verify. For the second animation, drag the slider to visually observe the relationship.
Summary
![Summary](https://beta.geogebra.org/resource/qbhkwj5x/tbXRxSpctFXUhCY3/material-qbhkwj5x.png)