Maths-
General
Easy

Question

The area enclosed within the curve vertical line x vertical line plus vertical line y vertical line equals 1 is

  1. square root of 2    
  2. 1    
  3. square root of 3    
  4. 2    

The correct answer is: 2


    The given lines are plus-or-minus x plus-or-minus y equals 1
    That is ,
    x plus y equals 1 comma x minus y equals 1 comma x plus y equals negative 1 text  and  end text x minus y equals negative 1
    These lines form a quadrilateral whose vertices areblank A left parenthesis negative 10 right parenthesis comma B left parenthesis 0 comma negative 1 right parenthesis comma C left parenthesis 10 right parenthesis and D(0, 1) Obviously, ABCD is a square. The length of each side of this square is
    square root of 1 to the power of 2 end exponent plus 1 to the power of 2 end exponent end root equals square root of 2
    Hence, the area of square is
    square root of 2 cross times square root of 2 equals 2 text  sq. unit end text
    Trick: The required area is
    fraction numerator 2 c to the power of 2 end exponent over denominator vertical line a b vertical line end fraction equals fraction numerator 2 cross times 1 to the power of 2 end exponent over denominator vertical line 1 cross times 1 vertical line end fraction equals 2

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