Answer:
1. They are equal.
2. they are equal. diagonals of an isosceles trapezoid are equal.
3. AB = ½(Sum of QR and ST)
4. they are parallel
5. if two diagonals are equal, trapezoid ABCD is an isosceles trapezoid.
6. they are equal. Area of two triangle form by bisecting of longer diagonal of kita are equal.
