Triangle Angle Word Problem 2

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Taught by YourMathGal
  • Currently 4.0/5 Stars.
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Lesson Summary:

In this lesson, Julie Harland explains how to solve a word problem involving angles in a triangle by remembering that the sum of the measures of the three angles of the triangle is 180 degrees. She demonstrates how to define the three angles and set up an equation to solve for their measures. By using algebra, she shows how to find each angle and check that the angles add up to 180 degrees. Finally, she emphasizes the importance of organizing and presenting the answer correctly.

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:
  • If one angle of a triangle is twice the measure of the second angle, and the third angle is 10 degrees less than the measure of the first angle, what is the measure of each angle?
  • If the angles in a triangle are x, 2x, and 2x - 10, what does x equal and what are the measures of the angles in the triangle?
  • How do you write and solve an equation to find the measures of angles in a triangle?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson tackles a word problem involving a triangle in which you know some relationships between the angles, but you need to write and solve an equation to find the measures of the angles. All steps involved in writing out and solving the equation are shown and explained.