Answer :
Consider, D(x,y,z) point equidistant from points A(a, 0, 0), B(0, b, 0), C(0, 0, c) and O(0, 0, 0).
∴ AD = 0D
Squaring both sides,
=
x2 +2ax + a2 + y2 + z2 = x2 + y2 + z2
a(2x-a) = 0
as a ≠ 0.
X = a/2
∴ BD = 0D
Squaring both sides,
=
x2 + y2 + 2by + b2 + z2 = x2 + y2 + z2
b(2y-b) = 0
as b ≠ 0.
y= b/2
∴ CD = 0D
Squaring both sides,
=
x2 + y2 + z2 + 2cz + c2 = x2 + y2 + z2
c(2z-c) = 0
as c ≠ 0.
z= c/2
Therefore, the pint D(a/2,b/2,c/2) is equidistant to points A(a, 0, 0), B(0, b, 0), C(0, 0, c) and O(0, 0, 0).
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