What you do is you multiply the base by the height then you must half your answer. Eg: A triangle with a base of 2 cm and a height of 4cm, you would do 2x4=8 then half your answer to get 4cm squared.
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There is insufficient information to calculate the area.
Area = 0.5*base*altitude
length times width squared
A triangle is a flat area, therefore it has a surface area, not a volume. Density is unrelated to the problem; you would need some additional information to calculate the surface area.
That is not possible. A triangle is an area. Cubic meters belong to volume or capacity.