Mathematics is like music – Enjoy it!!!
This playlist consists of 101 questions, concepts, theorems and examples of class 9 chapter 13 (Surface Areas and Volumes) of class 9, NCERT textbook. Click a thumbnail to watch the tutorial. Every video in this series has been thoroughly visualised…
Read MoreVolume of Cylinder vs Cone The volume of a cone is exactly one-third of the volume of a cylinder with same base radius and height. The following activity is very easy for you to perform at home to verify this.…
Read MoreExample 14: At a Ramzan Mela, a stall keeper in one of the food stalls has a large cylindrical vessel of base radius 15 cm filled up to a height of 32 cm with orange juice. The juice is filled…
Read MoreExample 13: The pillars of a temple are cylindrically shaped (see Fig. 13.26). If each pillar has a circular base of radius 20 cm and height 10 m, how much concrete mixture would be required to build 14 such pillars?…
Read MoreQuestion 8: A patient in a hospital is given soup daily in a cylindrical bowl of diameter 7 cm. If the bowl is filled with soup to a height of 4 cm, how much soup the hospital has to prepare…
Read MoreQuestion 7: A lead pencil consists of a cylinder of wood with a solid cylinder of graphite filled in the interior. The diameter of the pencil is 7 mm and the diameter of the graphite is 1 mm. If the…
Read MoreQuestion 6: The capacity of a closed cylindrical vessel of height 1 m is 15.4 litres. How many square metres of metal sheet would be needed to make it? Question 5 Question 7
Read MoreQuestion 5: It costs Rs. 2200 to paint the inner curved surface of a cylindrical vessel 10 m deep. If the cost of painting is at the rate of Rs. 20 per m2, find inner curved surface area of the…
Read MoreQuestion 4: If the lateral surface of a cylinder is 94.2 cm2 and its height is 5 cm, then find (i) radius of its base (ii) its volume. (Use π = 3.14) Question 3 Question 5
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