Mensuration

1. The diagonal of a quadrilateral shaped field is 24 m and the perpendiculars dropped on it from the remaining opposite vertices are 6 m and 12 m. Find the area of the field.

2. The top surface of a stage is in the shape of a regular octagon with side 5 m. Find the area of the octagonal surface.

3. Find the volume of a cuboid whose length is 8 cm, width is 3 cm and height is 5 cm. 

4. Find the area of a triangle whose base is 4 cm and altitude is 6 cm.

5. Find the perimeter of a rectangle whose length is 4 cm and breadth is 3 cm.

6. A rectangular paper of width 7 cm is rolled along its width and a cylinder of radius 20 cm is formed. Find the volume of the cylinder

7. Area of a trapezium = Half of the sum of the lengths of parallel sides × ______

8. Find the volume of a cuboid whose length is 8 cm, breadth 6 cm and height 3.5 cm

9. If the edge of a cube is 1 cm then  its volume is

10. If the parallel sides of a parallelogram are 2 cm apart and their sum is 10 cm then its area is:

11. If the dimensions of a room are I, b and h, (∴. l → length, l → breadth and h → hight) then the area of its four walls?