There are several different formulae for the area of a triangle - depending on the available information - and these were invented by different people.
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If the base is a rectangle, use the formula for the area of a rectangle.
In the formula for the rectangle, put the width equal to the length.
A traingle covers half the area of a rectangle with the same base and [perpendicular] height.
of course base times height for a square or rectangle. but for a trapezoid a= h x "b1+b2"
In order to find the area of a rectangle, you must follow the formula A= l x w where A is area, l is length, and w is width.