Sadhana Bhadoriya

Ex – 9.2 Que No. 7 Q.7) A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal. How much sheet of metal is required? Solution:-

Ex – 9.2 Que No. 6 Q.6) Describe how the two figures at the right are alike and how they are different. Which box has larger lateral surface area? Solution:-

Ex – 9.2 Que No. 5 Q.5) Daniel is painting the walls and ceiling of a cuboidal hall with length, breadth, and height of 15 m, 10 m and 7 m respectively. From each can of paint 100 m2 of area is painted. How many cans of paint will she need to paint the room?

Ex – 9.2 Que No. 4 Q.4) Rukhsar painted the outside of the cabinet ofmeasure 1 m × 2 m × 1.5 m. How much surface area did she cover if she painted all except the bottom of the cabinet. Solution:-

Ex – 9.2 Que No. 3 Q.3) Find the side of a cube whose surface area is 600 cm2. Solution:-

Ex – 9.2 Que No. 2 Q.2) A suitcase with measures 80 cm × 48 cm × 24 cm is to be covered with a tarpaulin cloth. How many metres of tarpaulin of width 96 cm is required to cover 100 such suitcases? Solution:-

Ex – 9.2 Que No. 1 Q.1) There are two cuboidal boxes as shown in the adjoining figure. Which box requires the lesser amount of material to make? Solution:- The box with a smaller surface area will require less material. After comparing the surface area of both boxes (a) and (b), we find that the

Ex – 9.1 Que No. 11 Q.11) Diagram of the adjacent picture frame has outer dimensions = 24 cm × 28 cm and inner dimensions 16 cm × 20 cm. Find the area of each section of the frame, if the width of each section is same. Solution:-

Ex – 9.1 Que No. 10 Q.10) There is a pentagonal shaped park as shown in the figure. For finding its area Jyoti and Kavita divided it in two different ways. Solution:- By Jyoti’s diagram – By Kavita’s diagram –

Ex – 9.1 Que No. 9 Q.9) Top surface of a raised platform is in the shape of a regular octagon as shown in the figure. Find the area of the octagonal surface. Solution:-