On Friday, the class reviewed a concept that they learned a few years ago in math: that the sum of the measures of the three angles in a triangle is always 180 degrees. We even tore apart triangles and placed the three angles together and noted how they fit together, side by side, to make a straight line (or a straight angle which measures 180 degrees). If students are given a problem with expressions for the three angles inside a triangle, they should add together the measures for the three angles and set it equal to 180 degrees. Then, they should solve that equation.
The class also learned that an exterior angle (an angle formed by extending a side of a triangle beyond the triangle) has a measure equal to the sum of the two non-adjacent (meaning "not next to") interior angles. If the students are given a problem with an expression for an exterior angle of a triangle, they should add together the measures of the two angles that do not touch the exterior angle and set that equal to the measure of the exterior angle. Then they should solve that equation.
Homework: Triangle Angle Worksheet
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