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How to Construct Pascal's Triangle. In Pascal's Triangle, the top row is 1, with the second row just below it containing 1 and 1. To construct each subsequent row, add each pair of numbers, moving from left to right so that each number on a row is the sum of the two numbers just above it, to the right and the left.Put a 1 on both ends of each row.o construct each subsequent row, add each pair of numbers, moving from left to right so that each number on a row is the sum of the two numbers just above it, to the right and the left. Put a 1 on both ends of each row.
Proof of Concurrency of Angle Bisectors of a Triangle. - Given a triangle ABC, construct the angle bisectors of angle BAC and angle ABC. - Mark the intersection of of the two rays as the point K. - From the point K, construct segments that are perpendicular to each of the three sides of the triangle. - Label the intersection points on side BC, AC, AB as D, E, F respectively. - Now consider triangle BFK and triangle BDK. - angle BDK = angle BFK since they are both right angles.