__Angle Sum Theorem__
- the sum of the measures of the angles of a triangle is 180

__Exterior Angle Theorem__
- The measure of an exterior angle of a triangle is equal to the
sum of the measures of the two remote interior angles

__Third Angle Theorem__
- if two angles of one triangle are congruent to two angles of
a second triangle, then the third angles of the triangles are
congruent

__Remote Interior Angle__
- in the figure below, a and c are remote interior angles

Included Angle - the angle formed by two given sides

Included Side - the segment of the triangle that is the side of two angles

*Explorations with GSP

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