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You have six faces. Two are bounded by length and width, two by length and depth, and two by width and depth. Each face has an area of the two dimensions that bound it (from the formula for the area of a rectangle).

F1 = L * W

F2 = L * W

F3 = L * D

F4 = L * D

F5 = W * D

F6 = W * D

Adding these six together gives the total surface area, which, simplified, produces:

SAcuboid = 2(LW + LD + WD)

Q: What is the derivation of the formulae of the surface area of a cuboid?

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2(l*w)+2(l*h)+2(w*h) * * * * * That is only true for a cuboid. Other bodies also have surface areas and there are lots of formulae dealing with them.

Make it infinitesimally small.

The answer will depend on what the surface area is of. The surface areas of regular shapes are can be calculated from formulae but these will depend on the shapes. For non-regular areas there may or may not be simple formulae.

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Surface area of a cuboid with sides x, y and z is 2(xy+yz+zx) So surface = 2*(1.45*1.45 + 1.45*5 + 5*1.45) = 2*16.6025 = 33.205

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derivation of surface area of cuboid

You can approximate the surface area by lots of triangles (base of the triangle on the base of the cone, and tip of the triangle at the tip of the cone), and analyze what happens when the triangles get narrower and narrower.

2(l*w)+2(l*h)+2(w*h) * * * * * That is only true for a cuboid. Other bodies also have surface areas and there are lots of formulae dealing with them.

Surface Area of a cube is equal to the sum of the area of it sides. Each of its sides are square of side length a. Each side has area of a2. There are 6 sides on a cube. a2 + a2+ a2+ a2+ a2+ a2 = 6a2 Therefore: Surface area of a cube is 6a2

Lateral surface area of a cuboid = 2 (Length + Breadth) × Height Lateral surface area of a cube = 4 × Side2

A cuboid is a 3 dimensional object and 3 measures are required for the total surface area of a cuboid.

There are different formulae for their volume, surface area, mass, etc. You have not specified what formula and for what purpose.There are different formulae for their volume, surface area, mass, etc. You have not specified what formula and for what purpose.There are different formulae for their volume, surface area, mass, etc. You have not specified what formula and for what purpose.There are different formulae for their volume, surface area, mass, etc. You have not specified what formula and for what purpose.

Let its dimensions be a, b and c:- Surface area of the cuboid: 2*(a*b)+2*(b*c)+2*(a*c) in square units

The surface area of a box, which is a cuboid, depends on its length, width and height. A cube is a special type of cuboid in which the length , width and height are all the same.

yes

Make it infinitesimally small.

The answer will depend on what the surface area is of. The surface areas of regular shapes are can be calculated from formulae but these will depend on the shapes. For non-regular areas there may or may not be simple formulae.