Ncert solutions for class 9 maths chapter 13 exercise 13.1
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Solution: Volume of frustum will be equal to the volume of wire and by using this relation we can calculate the length of the wire. For other questions please visit to or or or or or or or or go for Solutions. Find the radius of the resulting sphere. Here the curved surface of the hemisphere is a depression, unlike a projection in the previous question Total Surface Area Question 6: A medicine capsule is in the shape of a cylinder with two hemispheres stuck to each of its ends. It is important to build a strong base in maths.

Also find the cost of metal sheet used to make the container, if it costs Rs 8 per 100 cm 2. For other questions please visit to or or or or or or or or go for Solutions. If its radius on the open side is 10 cm, radius at the upper base is 4 cm and its slant height is 15 cm, find the area of material used for making it. Find the inner surface area of the vessel. Shanti Sweets Stall was placing an order for making cardboard boxes for packing their sweets.

A cubical box has each edge 10 cm and a cuboidal box is 10 cm wide, 12. These chapters lay a foundation for the chapters that will come in class 10. Find the ratio of the total surface of the given cube and that of one of the cuboids. Find the volume of a sphere whose surface area is 154 cm 2. Besides this, there are many properties of inequalities and triangles in this chapter for students to learn.

A plethora of interesting topics such as the Surface Area of a Right Circular Cone and Surface Area of a Right Circular Cylinder will be learnt in this chapter with the help of interactive activities, solved examples and explanatory images and figures. As you move forward and study 5 exercises you will learn about presenting data in tabular form by keeping them together in regular intervals, polygon, histogram, or bar graph drawing. Find the height of the cylinder. It takes 500 complete revolutions to move once over to level a playground. A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. Assuming that the stitching margins are very small and therefore negligible, how much tarpaulin would be required to make the shelter of height 2.

How many bricks of dimensions 22. If the cost of the cardboard is Rs. Each brick absorbs one seventeenth of its own volume of water. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs. What length of tarpaulin 3m wide will be required to make conical tent of height 8m and base radius 6m? A bus stop is barricaded from the remaining part of the road, by using 50 hollow cones made of recycled cardboard. Therefore, the volume of this iron sphere will be equal to the volume of 27 solid iron spheres.

In a hot water heating system, there is a cylindrical pipe of length 28 m and diameter 5 cm. In this chapter, students will get a good grip on crucial topics such as Surface Area of a Cuboid and a Cube. Visit to main page or move to of the page. Curved surface area of a cone is 308 cm 2 and its slant height is 14 cm. Find the volume of water left in the cylinder, if the radius of the cylinder is 60 cm and its height is 180 cm. Find the capacity of the glass. What is the greatest diameter the hemisphere can have? The total height of the toy is 15.

This is one subject that will be useful for every student irrespective of their branch. How many bricks can be put in without overflowing the water, each brick being 22. A toy is in the form of a cone of radius 3. The volume of a right circular cone is 9856 cm 3. Porous bricks are placed in the water until the cistern is full to the brim.

Find the maximum number of wooden crates each measuring 1. Find the length and mass of the wire, assuming the density of copper to be 8. If the height of the conical heap is 24 cm, find the radius and slant height of the heap. Ignoring the thickness of the plastic sheet, determine: i The area of the sheet required for making the box. Find the number of lead shots dropped in the vessel. The diameter of the moon is approximately one fourth of the diameter of the earth.

Find the total surface area of the remaining solid to the nearest cm 2. Each cone has a base diameter of 40 cm and height 1 m. The bigger of dimensions 25 cm by 20 cm by 5 cm and the smaller of dimensions 15 cm by 12 cm by 5 cm. Its height is 8 cm and the radius of its top, which is open, is 5 cm. Ans : The given tank is cuboidal in shape having its length l as 20 m, breadth b as 15 m, and height h as 6 m. If you are curious this chapter can be very interesting for you to learn and understand.