The exterior angle of a triangle is equal to the sum of the two nonadjacent interior angles of the triangle. ); listeners: [], Here is another example of finding the missing angles in isosceles triangles when one angle is known. View US version. We have hundreds of math worksheets for you to master. It all has to add up to 180 degrees, if this amount is 57 you can do 180 minus 57 to get the remaining amount. For more on this see Triangle external angle theorem. A massive topic, and by far, the most important in Geometry. The second rule states that the Exterior Angle of a Triangle is supplementary to the adjacent angle. We first add the two 50° angles together. To find angle ‘b’, we subtract both 50° angles from 180°. This video is about exterior angles of a triangle. We’re going to take ninety degrees and we’re going to add it to 33 degrees to get 123 degrees. The Exterior Angle of a Triangle is created by the extension of one side of the triangle and the adjacent side. Since exterior angle and interior angle add to 180 degrees. Example 1: In Figure 1, if m ∠1 = 30° and m ∠2 = 100°, find m ∠4. An exterior angle of a triangle is equal to the sum of the opposite interior angles. In the case of this triangle we have a right angle here which is of course 90 degrees and we also have 33 degrees. x = 92Â° â 50Â° = 42Â° An exterior angle of a triangle is equal to the sum of the two opposite interior angles. Exterior Angle of a Triangle is Greater Than either of its Interior Opposite Angles. Properties. Another way to calculate the exterior angle of a triangle is to subtract the angle of the vertex of interest from 180°. In Figure 1, ∠ BCD is an exterior angle of Δ ABC.. Because m ∠1 + m ∠2 + m ∠3 = 180°, and m ∠3 + m ∠4 = 180°, you can prove that m ∠4 = m ∠1 + m ∠2.This is stated as a theorem. Finding an Angle in a Right Angled Triangle Angle from Any Two Sides. x + 50Â° = 92Â° (sum of opposite interior angles = exterior angle) The sum of the exterior angles of a polygon is 360°. Each Exterior Angle sums with its adjacent Interior Angle to form a 180 degree straight line. The following example shows how we extend a typical triangle’s sides to create its three Exterior Angles. Example A: If the measure of the exterior angle is (3x - 10) degrees, and the measure of the two remote interior angles are 25 degrees and (x + 15) degrees, find x. In formula form: m

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