Isosceles Triangles (Part Two)
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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:
- Isosceles Triangle Definition - An explanation of isosceles triangles and what that means for the triangle.
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?
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Staff Review
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.
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