3. For numbers 1 - 5, choose the letter of the best answer.
1. Which of the following is sufficient to guarantee that a quadrilateral is a parallelogram?
A. The diagonals are perpendicular
C. Pair of adjacent sides are congruent
B. Two consecutive angles are
D. The diagonals bisect each other congruent

2. What values of x and y guarantee that Quadrilateral ABCD is a parallelogram?
A. X = 640, y = 1160
B. X= 320, y = 1169
C.x = 640, y = 640
D. x= 320, y = 640

3. In the same figure above, If AD = 2x - 10 х cm and BC = x + 30 cm, then BC =
A. 50 cm
B. 60 cm
C. 70 cm
D. 80 cm

4. Quadrilateral ABCD is a parallelogram. If D с mZB = (x + 40)° and m 2D = (2x + 20)°, what is mZB?
A. 50 degree
B. 60 degree
C.70 degree
D. 80 degree

5. Quadrilateral ABCD is a parallelogram. If m ZA = (3x - 10)° and m 2D = (2x + 40)°, what is m ZA?
A. 50 degree
B. 60 degree
C. 70 degree
D. 80 degree



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