Half the base times the vertical height, all measurements in feet.
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With great difficulty since area cannot be measured in feet. Feet is a measure of length, not of area.
It is square ft.
The height is a linear measure and so cannot be "11.3 ft by 4.3 ft", which is a measure of an area.
Area of any triangle: 0.5*base*height
Using Pythagoras' theorem its height is 8.660254038 Area = 1/2*10*8.660254038 = 43.30127019 or 43 sq ft to the nearest sq ft
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