diff --git a/code/__HELPERS/game.dm b/code/__HELPERS/game.dm
index d118286274..af253f4b01 100644
--- a/code/__HELPERS/game.dm
+++ b/code/__HELPERS/game.dm
@@ -61,18 +61,6 @@
 /proc/isNotAdminLevel(var/level)
 	return !isAdminLevel(level)
 
-//Magic constants obtained by using linear regression on right-angled triangles of sides 0<x<1, 0<y<1
-//They should approximate pythagoras theorem well enough for our needs.
-#define k1 0.934
-#define k2 0.427
-/proc/cheap_hypotenuse(Ax,Ay,Bx,By) // T is just the second atom to check distance to center with
-	var/dx = abs(Ax - Bx)	//sides of right-angled triangle
-	var/dy = abs(Ay - By)
-	if(dx>=dy)	return (k1*dx) + (k2*dy)	//No sqrt or powers :)
-	else		return (k2*dx) + (k1*dy)
-#undef k1
-#undef k2
-
 /proc/circlerange(center=usr,radius=3)
 
 	var/turf/centerturf = get_turf(center)
diff --git a/code/controllers/_DynamicAreaLighting_TG.dm b/code/controllers/_DynamicAreaLighting_TG.dm
index efa2a226b1..ae570e919c 100644
--- a/code/controllers/_DynamicAreaLighting_TG.dm
+++ b/code/controllers/_DynamicAreaLighting_TG.dm
@@ -115,7 +115,7 @@ datum/light_source
 			dist = 0
 		else
 #ifdef LIGHTING_CIRCULAR
-			dist = cheap_hypotenuse(A.x, A.y, __x, __y)
+			dist = sqrt((A.x - __x)**2 + (A.y - __y)**2)
 #else
 			dist = max(abs(A.x - __x), abs(A.y - __y))
 #endif
diff --git a/code/game/objects/effects/chemsmoke.dm b/code/game/objects/effects/chemsmoke.dm
index 357996351d..0b31bca4ad 100644
--- a/code/game/objects/effects/chemsmoke.dm
+++ b/code/game/objects/effects/chemsmoke.dm
@@ -65,7 +65,7 @@
 	//build affected area list
 	for(var/turf/T in view(range, location))
 		//cull turfs to circle
-		if(cheap_pythag(T.x - location.x, T.y - location.y) <= range)
+		if(sqrt((T.x - location.x)**2 + (T.y - location.y)**2) <= range)
 			targetTurfs += T
 
 	//make secondary list for reagents that affect walls
@@ -145,7 +145,7 @@
 							if(istype(A, /obj/effect/effect/smoke/chem))	//skip the item if it is chem smoke
 								continue
 							else if(istype(A, /mob))
-								var/dist = cheap_pythag(T.x - location.x, T.y - location.y)
+								var/dist = sqrt((T.x - location.x)**2 + (T.y - location.y)**2)
 								if(!dist)
 									dist = 1
 								R.reaction_mob(A, volume = R.volume / dist)
diff --git a/code/game/objects/explosion.dm b/code/game/objects/explosion.dm
index 9c61234a07..c9e1654eb5 100644
--- a/code/game/objects/explosion.dm
+++ b/code/game/objects/explosion.dm
@@ -1,11 +1,5 @@
 //TODO: Flash range does nothing currently
 
-//A very crude linear approximatiaon of pythagoras theorem.
-/proc/cheap_pythag(var/dx, var/dy)
-	dx = abs(dx); dy = abs(dy);
-	if(dx>=dy)	return dx + (0.5*dy)	//The longest side add half the shortest side approximates the hypotenuse
-	else		return dy + (0.5*dx)
-
 ///// Z-Level Stuff
 proc/explosion(turf/epicenter, devastation_range, heavy_impact_range, light_impact_range, flash_range, adminlog = 1, z_transfer = 1)
 ///// Z-Level Stuff
@@ -88,7 +82,7 @@ proc/explosion(turf/epicenter, devastation_range, heavy_impact_range, light_impa
 		var/z0 = epicenter.z
 
 		for(var/turf/T in range(epicenter, max_range))
-			var/dist = cheap_pythag(T.x - x0,T.y - y0)
+			var/dist = sqrt((T.x - x0)**2 + (T.y - y0)**2)
 
 			if(dist < devastation_range)		dist = 1
 			else if(dist < heavy_impact_range)	dist = 2