Question 480857
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Hi,
A 21 inch square TV is on sale at the local electronics store.
Let x represent the length of the side of the screen
Using the Pythagorean theorem:
  x^2 + x^2 = 21^2
   2x^2 = 441
    x^2 = 220.5
      x = sqrt(220.5) =  14.85in