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Date: Geometry A Triangle Sum Theorem & Exterior Angle Theorem CHECK 1. Name and find the measure of the angle with the (?). Use appropriate geometric symbols. 80 350 1230 690 A U s 2. Name and find the measure of the angle with the (?). Use appropriate geometric symbols. a b . D 70 C 490 24 1430 G C E 3. Find the value of the variable in the diagrams below. a. b. 80 x+ 70 9x + 4 16.x - 4 760 410