The two outer corners of the triangle are 100 degrees and 150 degrees. find the third outer corner.

To complete the task, you need to remember some of the properties of the outer corners of the triangle. In particular, the fact that the sum of the degree measures of the outer angles of one triangle, taken one at each vertex, is 360 °. Therefore, in order to find the third outer angle of the triangle with the known two others, it is necessary to add the degree values of the known angles, and then, subtract the resulting sum from 360 °. Let’s calculate:

100 + 150 = 250

360 – 250 = 110

Answer: The third outer angle of the given triangle is 110 °.