Triangles are plane figures, so they don't have volume. To find THE AREA OF A TRIANGLE, multiply the length of its base by its height and divide by two. "Base": turn the triangle so one side is level to the ground, the bottom of the page, whatever; that side's the "base". "Height": measure straight up from the base to the opposite vertex (corner).
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To find the volume, you first find the area of the triangle base and then multiply it be the height.
There is no such thing as a 3D triangle.
The Surface area of a triangle = 0.5*base*height The volume of a prism = area of its cross-section*length
A triangle is a 2 dimensional object, it doesn't have a volume.
Since a triangle is two-dimensional, it cannot have volume.