It depends on what other information you have. There are different formulae depending on whether you have the lengths of two legs, one of the legs and the hypotenuse, a leg and and angle etc.
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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
you can't unless you measure it.
One-half the base.
if the triangle has one right angle in it
There is no right triangle on the right! (Ignore the length of the hypotenuse of a right triangle.) if you have the length of the two legs (base and the upright side): (base x upright) ÷ 2 = area of the right angle triangle.