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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.
Attempt 2: 8-step solution using a 15-75-90 triangle It turns out that @Blue's successful 7-step solution uses much the same circles and 15-75-90 triangle as the one proposed here. Take one step to create $\circ A$ with radius $AO$. Take as point $E_1$ the 'left' resulting point of intersection.