An[b] isosceles trapezoid[/b] is a trapezoid with congruent legs.
Click Show sides and angles. What do you notice about each pair of base angles of the isosceles trapezoid? Move one of the blue points to verify your conjecture.
Click Show Diagonals. What do you notice about the length of each diagonal of the trapezoid? Move one of the blue points to verify your conjecture.