In order to find the SA(surface area) of a three dimensional figure is simply the sum of the areas of all the surfaces of a figure. Formulas: Polyhedron=(FBa)2+(TB0)2+(LRi)2 Cylinder=2pi(RaRa)+2pi(RaH) Sphere=4pi(RR) F=front Ba=back T=top Bo=bottom L=left Ri=right Ra=radius H=height pi=3.14 nn=that number squared
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least volume and most surface area is 3D triangle
There no such thing as perimeter of 3D objects . Generally perimeter is for 2D objects but you can find the surface are of a cube if you wished to ask that. Surface area of cube is - 6 x side x side.
The cone IS a 3d figure.
For a cuboid (a 3D rectangle) of width W, height H and depth D, the surface area is: (WH + WD + HD) x 2.
There's no such thing as "area of a box" unless you mean "surface area of a box." Length * width * height gives you the volume of a 3D box. Length * width gives area of a 2D rectangle. Surface area of a box can be found by calculating the area of each face and adding them together.