Triangle Angle Word Problem 1

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Taught by YourMathGal
  • Currently 4.0/5 Stars.
5847 views | 1 rating
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Lesson Summary:

In this lesson, Julie Harland teaches viewers about the basic triangle and how the sum of the three angles forms a straight line, thus adding up to 180 degrees. She then uses this concept to solve word problems involving triangle angles, such as finding the missing angle when given two angles or finding the measures of angles in an isosceles triangle. Harland also emphasizes the importance of including the degree symbol in solutions and checking answers by adding up the measures of all three angles.

Lesson Description:

Sum of angles in a triangle, isosceles triangle, right triangle word problems involving angles in a triangle.

More free YouTube videos by Julie Harland are organized at

Questions answered by this video:
  • What is the sum of the angles in a triangle?
  • What is an isosceles triangle?
  • If two angles in a triangle are 40 degrees and 60 degrees, what is the measure of the third angle?
  • If two angles of a triangle measure 53 degrees and 68 degrees, what is the measure of the third angle?
  • If one angle of an isosceles triangle is 15 degrees less than one of the equal angles, what are the measures of the three angles?
  • Why do angles in a triangle add up to 180 degrees?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson takes what you know about angles and finding values of variables in angles, and uses these ideas to find the measures of angles in a triangle. A few different problems are shown, and the angle measures are found for these triangles.