Half base x altitude.
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the formula for the area of a triangle is: base times height divided by two.
least volume and most surface area is 3D triangle
You measure or calculate the surface area; you measure or calculate the volume and then you divide the first by the second. The surface areas and volumes will, obviously, depend on the shape.
(height * width)/2
To calculate the area of a triangle - divide the length of the base by 2, then multiply that figure by the height. If the measurements are in centimetres, once you have your area - multiply your figure by 100 and you'll have the area in millimetres.