Learning Activity 1: Directions: Complete the two-column proof. Opposite angles of an isosceles trapezoid are supplementary. Given: Isosceles Trapezoid ARTS with RT sqrt / sqrt AS Prove: angle ARS and ZS are supplementary. angle A and angle T are supplementary. Statements 1. (1) 2. overline AR cong overline ST 3. (3) and angle ART cong angle S 4. angle A+ angle ART=180^ and angle S+ angle T= 180 degrees 5. angle A+ angle T=180^ and angle S+ angle ART= 180 degrees 6. (5) Reasons Given (2) The base angles of an isosceles trapezoid are congruent. Same Side Interior Angle Theorem lfloor4 rfloor Definition of Supplementary Angles​