While flipping a weighted coin, Tim gets 15 heads and 5 tails. Based on experimental probability, how many of the next 8 flips should Tim expect to come up tails?

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65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Which geometric principle is used to justify the construction below?