There is not enough information to answer this question. The measurements could apply to the sides, altitudes, or other characteristics of the triangle, such as the perimeter.
If the measurements are of a base and altitude, then using the area formula for a triange, which is one half the base times the altitude, we would get an answer of (1/2)*6*9 = 27
in whatever units of measurement that were used. (I am assuming that the units are the same for both measurements.)
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It is: 0.5*6*3 = 9 square meters
the formula for the area of a triangle is; a=1/2 base times height. so for example: a triangle may have a base length of 6 inches and a height of 3 inches. a=1/2 6(3) the answer would be: 9 inches.
Area of any triangle is: 0.5*base*height
Area is 31.5 units2
The base of the triangle is 13 units because 0.5*13*9 = 58.5 square units