Question

Three cubes each of volume 125cm^2 are joined end to end to form a cuboid find the total surface area of cuboid

Answer 1

Volume of cube =a3=125cm3

a=cube root of 125=5cm

So,length of cuboid=3×5=15cm

h=5cm

b=5cm

TSA of cuboid=2 (lh+bh+lb)

                         =2 (15+5+5+5+15+5)

                         =2×50

                         =100cm2

Answer 2

first find the edge of the cube...then find the tsa through it and then multiply it by the number of cubes(you'll get the tsa of the cuboid formed).For area,with the edge of the cube,f ind one's area and multiply it by 3(the no. of cubes) and you'll get the area of the formed cuboid as well:)

Hope this helps..:)