Because the units of area have dimension 2 - as in square centimetres or square feet.
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You don't. You put a cubed sign for volume, which surface area is not. Surface area gets a squared sign. The reason for THAT is to show it's a 2-dimensional measurement.
square roots of a negative number are imaginary, where i = square root (-1) sqrt (-2500) = sqrt (2500) i = 50 i
(square root sign)5 (square root sign)9 which then simplifies to.. 5 (square root sign)3 The square root sign wouldn't show up properly first time I saved the answer so that's why i have written in brackets where the square root sign should be =]
Area of the sign: (1/2)bh = 4 b=h (1/2)b2=4 b2=8 h=b= sqrt(8) = 2*sqrt(2)~ = 2.828 feet
You find the area of the whole square first. Then you find the area of the circle inside of it And then subtract the area of the circle from the area of the square and then you get the shaded area of the square