Q. If the distance of any point $(x,\ y)$ from the origin is defined as $d(x,\ y) =$max $\left\{ |x|,\ |y| \right\},\ d(x,y) = a$, non-zero constant, then the locus is

A) A circle
B) A straight line
C) A square
D) A triangle
Explanation

(b)
$d(x,y) = max\{|x|,\ |y|\}$ …(i)
$but\ d(x,y) = a$ …(ii)
From, Eqs. (i) and (ii),
$a = {max\ }\left\{ |x|,\ |y| \right\}$
If $|x| > |y|,\$ then $a = |x|$
$\therefore\ x = \pm a$
$and\ if\ |y| > |x|,\$ then $a = |y|$
$\therefore y = \pm a$
Therefore, locus represents a straight line

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.