Perpendicular Distance

Question

Find the perpendicular distance from the point P(5, 4, 1)

to the y-axis.

Answer 1

(0,4,0) vs (5,4,1)

distance formula says:

sqrt( (5-0)^ + (4-4)^2 + (1-0)^2 )

= sqrt( 5^2 + 0^2 + 1^2)

= sqrt( 25 + 1)

= sqrt(26)