Distance between two parallel planes

Distance OF point from the line || Distance between two parallel lines || Distance between two skew line || Illustration on cross product

The distance between two parallel lines can be taken out by the formula

Shortest distance between two parallel lines in vector + cartesian form

Find the distance between the parallel planes x+y-z+4=0 and x+y-z+5=0

Perpendicular distance between point & line || Distance between two parallel line || Image OF a point with respect to various cases || Area OF parallelogram & Isosceles triangle

An object is placed between two parallel plane mirrors. Why do the distance images get fainter and fainter ?

Find the distance between two parallel tangents of a circle of radius 3 cm.

What is the distance between two parallel tangents of a circle of radius 4cm?

What is the distance between two parallel tangents to a circle of radius 5cm?