Exterior Sum Theorem at Exterior

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Exterior Sum Theorem. The following diagram shows the exterior angle theorem. A to a theorem is a statement that can be proved easily by using the theorem.

Triangle Sum and Exterior Angle Theorem 2019 YouTube
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The sum of the measures of the exterior angles is the difference between the sum of measures of the linear pairs and the sum of measures of the interior angles. Therefore, the values of x and y are 140° and 40°, respectively. In this video, i introduce two theorems that are critical in a students understanding of triangles:

Triangle Sum and Exterior Angle Theorem 2019 YouTube

The above statement can be explained using the figure provided as: Triangle sum theorem, and the exterior angles theorem. Therefore, the values of x and y are 140° and 40°, respectively. Taking one exterior angle at each vertex, the sum of any polygon’s exterior three angles is always 360 °.