Because the formula to calculate the area is height x (base/2)
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1/2bh b=base h=height To find the are of a triangle,you have to multiply the base times height and divide the answer by 2. To find the area of a triangle you need to multiply all the sides of the triangle and then divide by 2.
You don't need to find it. From what your question states the area is already given to you.
You need to measure how wide it is and the height of the triangle then multiply them together and the you get your answere.
It is impossible, you need height or angles at least
you will need the base and the height of the traingle.the formula is 1/2 x base x height!!