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The Trisection of the Angle by Plane Geometry: Verified by Trigonometry with Concrete Examples. By Dr. J. Whiteford. Pp. 169.
The sum of the angles in a triangle is 180°. To find the sum of the interior angles of a polygon, multiply the number of triangles in the polygon by 180°.
Watch the demonstration video below to learn more about the PARA laser measure which is now available to back by Kickstarter with early bird pledges available from $179 or roughly £137.
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