A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm . Find its
(i) inner curved surface area,
(ii) outer curved surface area,
(iii) total surface area.
Archives for March 2014
Ncert Math Solutions Class 9th Chapter 13 Surface Areas and Volumes Exercise 13.2 Question 2
It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square metres of the sheet are required for the same?
Ncert Math Solutions Class 9th Chapter 13 Surface Areas and Volumes Exercise 13.2 Question 1
The curved surface area of a right circular cylinder of height 14 cm is 88
. Find the diameter of the base of the cylinder.
Ncert Math Solutions Class 9th Chapter 13 Surface Areas and Volumes Exercise 13.1 Question 8
Parveen wanted to make a temporary shelter for her car, by making a box-like structure with tarpaulin that covers all the four sides and the top of the car (with the front face as a flap which can be rolled up). Assuming that the stitching margins are very small, and therefore negligible, how much tarpaulin would be required to make the shelter of height 2.5 m, with base dimensions 4 m × 3 m?
Ncert Math Solutions Class 9th Chapter 13 Surface Areas and Volumes Exercise 13.1 Question 7
Shanti Sweets Stall was placing an order for making cardboard boxes for packing their sweets. Two sizes of boxes were required. The bigger of dimensions 25 cm × 20 cm × 5 cm and the smaller of dimensions 15 cm × 12 cm × 5 cm. For all the overlaps, 5% of the total surface area is required extra. If the cost of the cardboard is Rs 4 for 1000
, find the cost of cardboard required for supplying 250 boxes of each kind.
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