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These free geometry worksheets will introduce you to the triangle sum theorem, as you find the. 21) 84 ° x + 59 x + 51 a 44 ° 22) x + 37 x + 67 a 30 ° 23) 130 ° 8x + 4 3x − 6 a 30 ° 24) 80 ° 4x + 17 x + 23. This triangle worksheet will produce triangle angle sum problems. Web triangle angle sum worksheets. Web find the measure of angle a. Web in these pdf worksheets, the measure of one of the interior angles of each triangle is presented as an algebraic expression. The free printables in this post deal with finding the unknown angles of triangles. Web angles in a triangle worksheets.