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The dimensions of a cuboid are in the ratio of 1:2:3 and its total surface area is 88m2. Find its dimensions.

The dimensions of the cuboid are in the ratio 1:2:3 Let the dimensions be in metresSurface area ∴ The dimensions are 2 m, 4 m and 6 m.

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17 PQRS is a quadrilateral in which PQ =4 cms, QR = 9.2 cms, RS = 8cm SP = 6cm ∠ PSR = ∠ PQR = 90° . Find its area. 18 Find the surface area of a chalk box whose length, breadth and height are 16cm, 8cm and 6cm respectively. 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?  1

A flooring tile has the shape of a parallelogram whose base is 24 cm and the corresponding height is 10 cm. How many such tiles are required to cover a floor of area 1080 m2?