# Triangle Sum Theorem

## Interior angles add to 180 degrees

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Triangle Sum Theorem
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## RWA Triangle Sum Theorem

### Topic

Spherical Geometry

### Vocabulary

• triangle sum theorem
• comparing angles and sides in triangles
• sphere
• Spherical Geometry

### Extension Investigation

1. Students can make a presentation like the one below http://www.youtube.com/watch?v=b7DmUymGR28&feature=related
2. Virgo is one of the constellations of Zodaic. Three principal stars of the constellation form a triangle. If \begin{align*}m \angle S = 25\end{align*} and \begin{align*}m \angle P = 135\end{align*}, then find the \begin{align*}m \angle V\end{align*}. http://worksheets.tutorvista.com/angles-in-a-triangle-worksheet.html

#### Layering (optional)

How do we show that all of the angles the triangle add up to 180?

Watch these videos to see how

### Notes/Highlights Having trouble? Report an issue.

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