Maths-
General
Easy

Question

The acute angle made by the line joining the points left parenthesis 1 comma negative 32 right parenthesis and left parenthesis 3 comma negative 51 right parenthesis with the Y-axis is

  1. c o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 2 over denominator 3 end fraction close parentheses    
  2. c o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 1 over denominator 3 end fraction close parentheses    
  3. c o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 2 over denominator 5 end fraction close parentheses    
  4. c o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 3 over denominator 5 end fraction close parentheses    

hintHint:

We are given two points. We have to find the angle made by this line with the y-axis. We will use the direction ratios and direction cosine the find the answer.

The correct answer is: c o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 2 over denominator 3 end fraction close parentheses


    The given points are (1, -3, 2) and (3, -5, 1)
    We have to find the angle it makes with y-axis.
    Let the angle made by the line with the x, y and z axis be
    Direction ratios: Let’s represent direction ratios as a, b and c. If the given points are (x1, y1, z1) and (x2, y2, z2) then
    a = x1 – x2
    = 1 – 3
    = -2
    b = y1 – y2
    = -3 –(-5)
    = -3 + 5
    = 2
    c = z1 – z2
    = 2 – 1
    = 1
    Direction cosine of angle made with y axis will be given as

    cos beta equals fraction numerator b over denominator square root of a squared plus b squared plus c squared end root end fraction
space space space space space space space space space equals space fraction numerator 2 over denominator square root of 2 squared plus 2 squared plus 1 squared end root end fraction
space space space space space space space space space equals fraction numerator 2 over denominator square root of 9 end fraction
space space space space space space space space space equals 2 over 3
space
beta space equals space cos to the power of negative 1 end exponent left parenthesis 2 over 3 right parenthesis
    This is the required answer.

    We should remember the formula of direction cosines of all the angles.

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