Question

Calculate the distance between A (7, 3) and B on the x-axis whose abscissa is 11.

Answer 1

We know that any point on x-axis has coordinates of the form (x, 0).
Abscissa of point B = 11
Since, B lies of x-axis, so its co-ordinates are (11, 0).
AB = `sqrt((11 -7)^2 + (0 -3)^2)`
= `sqrt(16 + 9)`
= `sqrt(25)`
= 5 units