Explaination :
Here we would be using distance formula to calculate the distance between those two points. 
Points are, 
★ Distance Formula : 
We have : 
- x1 = -8 
- x2 = -2 
- y1 = 3 
- y2 = -5
Substituting the values : 
Additional Information :
Centroid of a triangle :- 
Midpoint of two points:-