It depends where the X is.
If you want the end across from the right angle, check out this answer.
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The general formula for a triangle is Base x Height / 2. That applies quite easily for a right angle triangle.
The given dimensions are not compliant for the construction of a right angle triangle but the area of any triangle is: 0.5*base*height
if the triangle has one right angle in it
First find the area of the square (length x width) then find the area of the triangle (base x height x 2) and add the two answers together.Quadrilateral just means "four sides", but the sides have to be straight.Assuming it's a right-angle triangle? Such a triangle is half of a rectangle or square, so times by 2).
(base x height) / 2