Question 516320
Distance between two points													
x1	y1	x2	y2										
d= 	{{{sqrt((y2-y1)^2+(x2-x1)^2)}}}												
3	4	-1	2										
d= 	{{{sqrt((		2	-	4	)^2	+	(	-1	-	3	)^2	)}}}
d= 	{{{sqrt((		-2	)^2	+	(	-4	)^2	)}}}				
d= 	{{{sqrt((		20	)  	)}}}								
d= 	4.47