Q18 of 45 Page 11

Find the surface area of a chalk box whose length, breadth and height are 16cm, 8cm and 6cm respectively.

Chalk box is in the form of cuboid. Surface area of the cuboid ∴ The area of the chalk box is 544 cm2.

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16 A rectangular piece of paper of dimensions 22cm by 12cm. is rolled along its length to form a cylinder. Find the volume of the cylinder so formed. 17 PQRS is a quadrilateral in which PQ =4 cms, QR = 9.2 cms, RS = 8cm SP = 6cm ∠ PSR = ∠ PQR = 90° . Find its area. 19 The dimensions of a cuboid are in the ratio of 1:2:3 and its total surface area is 88m2. Find its dimensions. 20 The length of a hall is 20m and width 16m. The sum of the areas of the floor and the flat roof is equal to the sum of the areas of the four walls. Find the height and volume of the hall?