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Module 1: Angle sizes and sums in triangles

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Exterior angles of a triangle

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XSIQ
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Geometry - Exterior angles of a triangle

Exterior angles of a triangle

By extending a side of a triangle we create exterior angles [1] next to
each interior angle. [2]

The pattern is that the exterior angle is the same size as the sum of the
2 angles inside and on the opposite side of the triangle.

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Links:
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[1] http://alison.com/#
[2] http://alison.com/#