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ICSE Class 8 Answered

A cuboid (3cm*4cm*5cm) is cut into unit cubes.  The ratio of the total surface area of all the unit cubes to that of the cuboid is  
Asked by Saptorshi09876 | 10 Dec, 2018, 11:09: PM
answered-by-expert Expert Answer
Volume of cuboid = 3 cm × 4 cm × 5 cm = 60 cm3
number of unit cubes made out of given cuboid = 60
Total Surface Area of unit cubes = 60 × 6 = 360 cm2 .
Surface area of given cuboid =  2×[ 3×4 + 4×5 + 5×3 ] = 2×[12 + 20 +15 ] = 94 cm2
 
Ratio of total surface area of unit cubes to the surface area of given cuboid =  360 : 94  =  180 : 47
Answered by Thiyagarajan K | 12 Dec, 2018, 11:32: PM

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