<PRE><B>Question 144075</B>
Assuming the field is a square and has area = 4.58 on the horizontal,
it has a side of sqrt(4.58) = 2.1401..
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The 15% slope has a gradiant of 0.15*90 degrees = 13.5 degrees
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The horizontal side projects to a hypotenuse of a right triangle
with an angle of 13.5 degrees adjacent to the 2.1401.. base.
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The length of that projected hypotenuse is 2.1401../cos(13.5)
= 2.2009..
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Therefore the horizontal square projects to a quadrilateral with area 
= 2.2009*2.1401 = 4.71012 ha
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Cheers,
Stan H. </PRE>