This proves how the sum of the interiror angles of a triangle always equal to 180 degrees :) | Triangle angles, Equality, Quadrilaterals
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Theorem 7.3 - Sides opposite to equal angles of a triangle are equal
![The Measure of an Exterior Angle of a Triangle is Equal to the Sum of the Measure of the two__.[SOLVED]](https://d138zd1ktt9iqe.cloudfront.net/media/seo_landing_files/the-measure-of-an-exterior-angle-of-a-triangle-is-equal-to-the-sum-of-the-measure-of-the-two-01-1621433039.png "The Measure of an Exterior Angle of a Triangle is Equal to the Sum of the Measure of the two__.[SOLVED]")
The Measure of an Exterior Angle of a Triangle is Equal to the Sum of the Measure of the two__.[SOLVED]
Elements of astronomy ..with explanatory notes, and questions for examination . A RECTILINEAR TRIANGLE. A RECTILINEAR RIGHT-ANGLED TRIANGLE. tres, meaning three. The sum of the three angles of anyrectilinear1 triangle is always
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