Minimum distance between a point and a line in latitude, longitude

Question

I have a line with two points in latitude and longitude
A: 3.222895, 101.719751
B: 3.227511, 101.724318

and 1 point
C: 3.224972, 101.722932

Ho

Answer 1

If you know how to calculate the distance of two points, get the distances between each two points, you get AB, AC, and BC. You want to know the closest distance between point C and line AB.

First get the value of P

P=（AB+BC+AC)/2

Using P, you need to get S

S=SQRT(（P(P-AC)（P-AB)(P-AC)) 

SQRT means square root. Then you get what you want by

2*S/AB