To find the base of a figure, you first need to identify the shape of the figure. The base of a figure is typically the bottom or lower side that forms the foundation or support for the rest of the shape. For example, in a triangle, the base is usually the side on which the triangle stands. In a rectangular prism, the base is one of the two parallel and congruent rectangular faces.
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You find the base of a figure depending on if it's 2D or 3D
2D- Get a measuring device and find the length of the base.
3D- Easiest way is to split it into parts. For example, you have a pentagon-shaped base, i would split it into 5 and find the base for 1 part and multiply it by 5.
Area of plane figure
You find the length and height of the shape, them you find the volume
Because the base of a cone is round, it is the only three dimensional figure with only one vertex.
The surface area of a space figure is the total area of all the faces of the figure
perimeter (P)=2(length+base) find length, area = length * base = (p/2-base)*base