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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 Alternatively, if you know the length of all three sides of a triangle, you can find the area using Heronâs formula. Read Calculate the Area of a Triangle for complete instructions.  For example, if the base of the triangle is 12 meters, and the height of the triangle is 7 meters, to find the area you would calculate: