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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.
1 Measure and cut the 4 triangular sides of the paper pyramid. 2  Make the base and sides of each triangle the same width as the base of the structure. 3  In this model, they should be 6 inches.4  Also measure and draw in flaps on the right side of each triangle, just as you did for each side of the base. Apply glue to the outside edge of one of the flaps on the base and press a triangle onto it. 2  Repeat with the other 3 sides. 3  Dab glue on one of the triangle flaps and join it to the section to the right. 4  Gently force the 2 sections inward so their apexes meet.