X is not a length necessarily, it is merely a "placeholder" for another unknown number. It can also be used to substitute for an expression or it could refer to a line, or an agle, or... Just about anything...
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The formula is: r2 x Pi x length (radius squared x 3.1416 x length). The result is expressed in cubic units.or this also worksdiameter x diameter x 0.7854 x length
(length of side)2 X 6 [or (length of side) X (length of side) X 6]
Area = Legth x Width In a square, Length = Width Therefore Area = Length x Length (or Width x Width) Area = Length squared Length = Square Root of 800 Perimeter = 4 x length Perimeter = 4 x Square Root of 800 Perimeter = 113.14
length X width X 2 + width x height x 2 + length x height x 2.
Area1 = length x length = l1 x l1 When length is double then the new length is l2=2 x l1 and the Area2 = l2 x l2 = (2 x l1) x (2 x l1) = 4 x l1 x l1 = 4 x Area1