c# - Rounding to 3 decimal places in a distance formula -

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i have double need rounded 3 decimal places. i'm not sure how accurately implement math.round. have far:

double distance= math.sqrt(deltax + deltay); math.round((decimal)distance, 3); console.writeline("distance :" + distance);

use return value of math.round (already noted uwe keim) , remove decimal cast.

double distance = math.sqrt(10.438295 + 10.4384534295); console.writeline("distance :" + math.round(distance, 3));

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