If you know how the latitude and longitude of two points calculate the distance between two points

Longitude at the same latitude (except for the Equator)
H x 111 X cosd = g (H = longitude difference between two locations d = local geographic latitude G = actual distance)

Cross-latitude triangle
For example, AB has two different longitude and latitude (a longitude and B latitude)
First, we can calculate the distance between the latitude B 'that is collocated with the point. After calculating the distance between A and B, we can obtain the result by using the stock theorem.

In short, the following general formulas are available:
Formula for distance between two points on the earth:
The longitude of the earth is A1 and A2 (positive E and negative W), and the latitude is B1 and B2 (positive N and negative S ).
Make a0 = (A1-A2) limit 2, b0 = (BI-B2) limit 2
F = √ sinb0 × sinb0 + cosb1 × cosb2 × sina0 × sina0

Then
1. linear distance between two points = 2fr
2. Minimum spherical distance between two points = arcsinf degrees 90 ° × degrees R (angle)
3. Minimum spherical distance between two points = arcsinf × 2R (radian)

Note: E, W, N, S = east-west north, r = Earth's radius; √ = root number; region = circumference rate.
Enter the formula and calculate it by yourself.