3X + 3 = 1020 3X + 3 - 3 = 1020 - 3 3X = 1017 3X/3 = 1017/3 X = 339 Which means that the first number is 339, the second number is 339 + 1 and the third number is 339 + 2. Therefore, three consecutive integers that add up to 1020 are 339, 340, and 341.
Please see the attached picture for all the vertices that are drawn. When you start drawing the diagonals, be cautious of the ones that you have already drawn.