Find the area of the cardboard required to make a closed box of length 25cm, 0.5m and height 15cm.

Find the volume of wood required to make a closed box of external dimensions , 80 cm 75 cm and 60 cm the thickness of walls of the box being 2 cm throughout.

Find the area of metal sheet required in making a closed hollow cone of base radius 7cm and height 24cm.

Find the minimum length in cm and correct to nearest whole number of the thin metal sheet required to make a hollow and closed cylindrical box of diameter 20 cm and height 35 cm. Given that the width of the metal sheet is 1 m. Also, find the cost of the sheet at the rate of Rs 56 per sq m. Find the area of metal sheet required, if 10% of it is wasted in cutting, overlapping, etc.

Find the perimeter of a rectangle with length 25 cm and width 15 cm.

Savitri had to make a model of a cylindrical kaleidoscope for her science project. She wanted to use chart paper to make the curved surface of the kaleidoscope. (see Fig 13.10). What would be the area of chart paper required by her, if she wanted to make a kaleidoscope of length 25cm with a 3.5cm radius?

Find the lateral surface area and total surface area of a cuboid of length 80cm, breadth 40cm and height 20cm.

Find the area of a table of length 1.5 m and breadth 20 cm.

Find the volume and total surface area of a cuboid, whose length = 15 cm, breadth = 10 cm and height = 8 cm.

Find the length of the longest rod that can be placed in a small box with length 20 cm , breadth 20 cm and height =10 cm

Find the volume and the total surface area of a cuboid ,whose : length = 15 cm , breadth = 10 cm and height = 8 cm