Triangle Sum Theorem Worksheet Doc. All triangles have 3 sides and 3 angles. Microsoft word worksheet triangle sum and exterior angle doc author.
These free geometry worksheets will introduce you to the triangle sum theorem as you find the measurements of the interior angles of a triangle. If m6 x m7 x 20 and m11 80 then x. By triangle sum theorem t he sum of the measures of the interior angles of a triangle is 180.
M 1 m 2 m 3 180 statement justification construct a line parallel to yz through point x.
Subtract 40 from both sides. Also included are exa. Equilateral triangles are triangles with three sides of equal length and three angles of equal degree. Solve for x and try a set of challenging problems as well.
