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my_great_dist <- function(lat1, long1, lat2, long2)
 {
 term1 <- sin(lat1 * pi/180) * sin(lat2 * pi/180)
 term2 <- cos(lat1 * pi/180) * cos(lat2 * pi/180) * cos((long1 - long2) * pi/180)
 ang <- acos(term1 + term2)
 dist <- 6367.445 * ang
 return(dist)
 }

my_great_dist

function(lat1, long1, lat2, long2)
 {
 term1 <- sin(lat1 * pi/180) * sin(lat2 * pi/180)
 term2 <- cos(lat1 * pi/180) * cos(lat2 * pi/180) * cos((long1 - long2) * pi/180)
 ang <- acos(term1 + term2)
 dist <- 6367.445 * ang
 return(dist)
 }

my_great_dist(4.5, -74.04, 7, -72.15)

[1] 347.6464

other_dist <- function(x1, y1, x2, y2)
{
term1<- x1 - x2
term2<- y1 - y2
dist <- sqrt(term1^2 + term2^2)
return(dist)
}

other_dist(1000000, 1000000, 1200000, 1350000)

[1] 403112.9