you can't unless you measure it.
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It is impossible to find the area of a triangle with no height, if the triangle had no height it would not even be a triangle, just a angle.
The height has not been given but the area of the triangle is: 0.5*height*base
If a right triangle has an area of 81 meters an a base of 9 meters its height is: 18 meters.
multiply the base of the triangle by the height then halve the answer.
Use the formula 1/2 the base * the height