Question

Practice Set 47
1. Find the total surface area of cubes having the following sides.
(i) 3 cm (ii) 5 cm in) 7.2 m
(iyy6.8 m V) 5.5 m
2. Find the total surface area of the cuboids of length, breadth and height as given below:
(i) 12 cm, 10 cm, 5 cm
(ii) 5 cm, 3.5 cm, 1.4 cm
(iii) 2.5 cm, 2 m, 2.4 m
(iv) 8 m, 5 m, 3.5 m​

Answer 1

Practice Set 47 Find the total surface area of cubes having the following sides. (1) 3 cm (ii) 5 cm (iii) 7.2 m (iv) 6.8 m (v) 5.5 m he total surface area of the cuboids of length, breadth and height as given below 1) 12 cm, 10 cm, 5 cm (ii) 5 cm, 3.5 cm, 1.4 cm fi) 2.5 cm, 2 m, 2.4 m (iv) 8 m, 5 m, 3.5 m matchbox is 4 cm long, 2.5 cm broad and 1.5 cm in height. Its outer sides are to b overed exactly with craft paper. How much paper will be required to n open box of length 1.5 m, breadth 1 m, and height l m is to be made for use on olley for carrying garden waste. How much sheet metal will be required to make the Ox? The inside and outside surface of the box is to be painted with rust proof pain t a rate of 150 rupees per sqm, how much will it post to paint the box? Maths is fun! There are some three-digit numbers which can be divided by the product of their digits without leaving a remainder. Example (i) Take the number 175, 1 x 7 x 5 = 35,17 (ii) Take the number 816, 8 X 1 X 6 = 48,10 =17 10816_12 48 (ii) Take the number 612, 6 x 1 x 2 = 12, 612 12. 12=51 The numbers 135, 312, 672 are some more numbers like these. Can you find other such numbers?

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