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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.
8. Find the middle point of one side of the triangle. Take your compass, and open it to wider than Â½ the length of one side of your triangle. Place the needle of the compass at one of the points, and draw the arc, like so. Then place the needle at an adjacent point, and draw the arc again, like this.