a^2+b^2=c^2. This is the Pythagorean theorem. It explains that when you have a right triangle, that is, a triangle in which one angle is exactly 90 degrees, the length of the line opposite the right angle multiplied by itself will equal the sum of the other two lines also multiplied by themselves.
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It ultimately depends on the areas of the two shapes: Acircle = pi*r2 Asquare = l2 Fraction shaded = Acircle / Asquare = pi*r2/ l2 If the circle fills the square (e.g. l=2r) then the formula simplifies considerably: pi*r2/4r2 = pi/4
Multiply the length of one side by itself !
Multiply (the length of any side) by (the length of any side).
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