1 Hints All trapezoids have two pairs of consecutive supplementary angles Trapezoid Property All trapezoids have at least one pair of parallel sides Isosceles Trapezoid Property Sides All isosceles trapezoids have at least 1 pair of opposite congruent sides legs Isosceles Trapezoid Property Angles All isosceles trapezoids have 2 pair s of consecutive congruent angles Isosceles Trapezoid Property Diagonals The diagonals of all isosceles trapezoids are congruent P Triangle Angle Sum 180 Alternate Interior Angle Theorem T 76 34 R 73 410 A Vertical Angle Theorem Same Side Interior Angle Theorem 2 P 21 97 45 65 thir an Isosceles Trapezoid Yes or No agonal Is this an Isosceles Trapezoid Yes or No