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Name: _____________________________________________ Date: ______________ Geometry Test: Interior, Exterior Angles and Isosceles Triangles. You must show work to get credit! 5. Proof that the base angles of an isosceles triangle are equal (congruent): Fill in the missing Reasons. Statements Reasons Triangle ABC Given AC = BC Given Draw CD to midpoint of AB AD = DB CD = CD Triangle ACD <A <B Triangle DCB