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