What is the value of b for the following triangular prism?

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To find the area of the base for this Triangular Prism we must use the following formula: A = ½*B*H

Where B is the base and H is the height.

Now we simply replace the data in the formula.
A = ½*2.8*3.75
A = 5.25 m² --->This is our triangular Base.

I hope this helps, Regards.