Any face of a prism can be its base. Conventionally, though, one of the triangular faces would be considered the base.
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You can only find the area of the base with this information. The volume divided by the height will give you the area of the base.
it is the bottom of the side. or you can find it by cutting one side and it will be the same as one side
If you want to calculate the area, any of the three sides can be the base. From the base, you draw a perpendicular line to the third angle, to get the height. The result will be the same (within the limit of drawing accuracy, of course), whatever side you choose as the base.
i can
Assuming you know the angle of ascension, and the base, you can calculate the height by recalling that tangent theta is height over base. Simple algebra from there: height is tangent theta times base.