1. Which of the following quadrilaterals has two pairs of adjacent sides equal and its diagonals intersect at 90 degrees?

2. Which one of the following is a regular quadrilateral?

3. The perimeter of a parallelogram whose parallel sides have lengths equal to 12 cm and 7 cm is:

4. If ∠A and ∠C are two opposite angles of a parallelogram, then:

5. If ∠A and ∠B are two adjacent angles of a parallelogram. If ∠A = 70°, then ∠B = ?

6. ABCD is a rectangle and AC & BD are its diagonals. If AC = 10 cm, then BD is:

7. Each of the angles of a square is:

8. Which of the following is not a regular polygon?

9. If the two angles of a triangle are 80° and 50°, respectively. Find the measure of the third angle.

10. In a parallelogram ABCD, angle A and angle B are in the ratio 1:2. Find the angle