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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.
Add the the sum of the angles in the triangle with two angles. For example, if you have a triangle inside a quadrilateral with the angles 45 and 20 degrees, you would get a sum of 65 degrees (20 + 45 = 65). Subtract the sum of the angles from 180 to get the third angle of the triangle. For example, if you have a triangle within a quadrilateral that has the angles 20 and 45 degrees you would get a third angle of 115 degrees (180 - 65 = 115). Add the two known angles of the quadrilateral with the new angle.