Ithum oru kanakkanu. Trignonometry allanne ullu. Manakanakku. Illelu vellam poonathil thadassam barum. Rate of velocity of water in the pipe. Angles between the corners of the intersection of each conjoint pipe. Three way entrie two way entries with help of walve. Plumbing is aun important peice of applied mathematics in mechanical emgineering.