Isosceles Triangles (Part Two)

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Taught by MrRutter
  • Currently 3.0/5 Stars.
7209 views | 2 ratings
Part of video series
Meets NCTM Standards:
Lesson Summary:

In this lesson on isosceles triangles, we learn how to find the angles of a picture of triangles using concepts such as straight lines adding to 180, angles in a triangle making 180, and the exterior angle equaling the sum of the two interior angles. By using these concepts, we can find every other angle in a shape where certain sides and angles are congruent. This lesson provides a clear and concise demonstration of how to solve for unknown angles in a variety of different triangles.

Lesson Description:

Learn how to find out the angles of a picture of triangles.

Additional Resources:
Questions answered by this video:
  • How do find angles if you have a picture with a bunch of triangles touching each other?
  • How do you find the angle measures if you just have a picture with tick marks?
  • How do you find angle measures in a picture with isosceles and equilateral triangles bunched together?
  • What is each angle measure in an equilateral triangle?
  • How many degrees are in a straight line?
  • If you know two angles in a triangle, how do you find the third angle?
  • If you know one angle in an isosceles triangle, how do you find the other two?
  • How do you find angle measures in a diagram if you do not start with any angle measures?
  • Staff Review

    • Currently 3.0/5 Stars.
    This video finishes off the problem introduced in Part 1 of Isosceles Triangles. This is a rather daunting problem at first glance, and it uses a lot of prior knowledge about angles and isosceles triangles. This is a great wrap-up problem to a section on angles and triangles.