1. How many sides does a-regular polygon have if each of its interior angles is 165°?

2. The four angles of a pentagon are 40°, 75°, 125° and 135°. The measure of the fifth angle is

3. The sum of the internal angles of a polygon is 10 right angles. Then the number of sides is

4. If one angle of a parallelogram is of 65°, then the measure of the adjacent angle is

5. If the length of a side of a rhombus is 6 cm, then the perimeter of the rhombus is

6. ABCD is a rectangle. Its diagonals meet at O.

OA = 2x - 1, OD = 3x - 2. Find x

7. Find the perimeter of the rectangle ABCD.

8. The four angles of a quadrilateral are in the ratio 1 : 2 : 3 : 4. The measure of its smallest angle is

9. In a parallelogram ∠A : ∠B = 1 : 2. Then, ∠A =

10. ABCD is a parallelogram as shown. Find x and y.