Splitting a polygon into triangles is a method used in calculating the sum of the interior angles of a polygon. using this method, how many triangles does a 7-sided polygon contain? a. 5. b. 6. c. 7. d. 8.

Lets say that a quadrilateral has been divided into two triangles, so the interior angles add up to 2 × 180 = 360°. This pentagon has been divided into three triangles, so the interior angles add up to 3 × 180 = 540°. In the same way, a hexagon can be divided into 4 triangles, a 7-sided polygon into 5 triangles etc.
so your answer is A. 5
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