A normal triangle is a 2-dimensional shape and has "area" not volume. The area is determined by the formula A = 1/2 (b x h) = bh/2, where b is the width of the base and h is the height from the base to the apex.
(for spherical triangles or triangular prisms, see the related questions)
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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.