As we know equipotential surface means there is no potential difference that is no work is done on surface.so lines of force must intersect surface at right angles to satisfy this statement,so that net work is zero.
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Lines that intersect right angles (ninety-degree angles) are described as perpendicular.
Angles do not normally intersect one another, although coterminus angles may be said to.
Angles that are separated by a distance. For example, any two angles of any polygon do not intersect and they are coplanar.
If two lines intersect at right angles then they are perpendicular!
The 2 diagonals of a rhombus intersect at right angles