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# Triangle Sum Theorem

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Practice Triangle Sum Theorem
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# Triangle Sum Theorem Teacher Contributed

## 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 $m \angle S = 25$ and $m \angle P = 135$, then find the $m \angle V$. 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