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3 x 4 x 5 = 60cm3
With great difficulty because more information about the dimensions of the cuboid are required.
The surface area of a cuboid is the sum of all the areas of all its faces: 2 ends + 2 fronts + 2 tops = 2 x (area_of_end + area_of_front + area_of_top). For a 2cm x 3cm x 5cm cuboid, the surface area is: 2 x (2 x 3 + 2 x 5 + 3 x 5) cm3 = 2 x (6 + 10 + 15) cm3 = 2 x 31 cm3 = 62 cm3
it is under root: l sq. + b sq. + h sq.
To find the missing measurement of a shape you have to look at the opposite side and see what it adds up to. Then you make that side and the other missing side add up to the opposite side