Answer :

Given: (x1,y1) = A(2, 1), θ = 45°

To find:


Length AB.


Explanation:


So, the equation of the line is


Formula Used:




x – y – 1 = 0


Let PQ = r


Then, the coordinate of Q is given by



x , y


The coordinate of point Q is


Clearly, Q lies on the line x + 2y + 1 = 0




r


Hence, the length of AB is


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