Formula used
Distance = √{( xa - xb)2 + (ya-yb)2} = √{( xb - xa)2 + (yb-ya)2}
1) P(3,6) and Q(-5,0)
distance = √(3 - -5)2 + (6 - 0)2 = 10
2) P(-8,2) and Q(4,-3)
distance = √(-8 - 4)2 + (2 - - 3)2 = 13
3) P(0,-1) and Q(-3,3)
distance = √(0 - -3)2 + (-1 - 3)2 = 5
4) P(-3,-6) and Q(-6,-2)
distance = √(-3 - -6)2 + (-6 - -2)2 = 5