From the amount of information provided in the question, the only way is by measuring it.
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It is the height of the perpendicular line from its vertex to its base
Area of any triangle: 0.5*base*perpendicular height
You cannot determine the height from the information provided: more is required.
Good Question! First, multiply the base x height. Then, divide the answer by 2.
The base is 13 units and the height is 6 units so use these dimensions to determine the 3rd side of the triangle.