sides nonagon. There are eight points OTHER THAN the vertex. A nonagon is nine-sided polygon. Anonymous. The 9C2 lines also contain the sides of the nonagon. The number of diagonals in a polygon = 1/2 N(N-3) Here N = 6 = 1/2 x 6 (6-3) = 3 x 3 = 9 Answer: 9 Joel L. Lv 6. 0. Kartik Kumar 2 years ago. 5. More specifically, a square is a regular quadrilateral, or four-sided shape. The formula for finding the diagonals of a polygon with n-sides is n(n-3)/2. From here you just plug and chug. Phillipe Put/CC-BY 2.0. 3 0. 4. 0 0. In these page, we also have variety of images available. The value of n is. 8. 7 years ago. Answer this question. If a polygon has 252 diagonals, how many sides does it have? So the answer is n(n-3)/2. Let's take the nonagon below. Here’s a problem for you: If a polygon has 90 diagonals, how many sides does it have? Anonymous. 0 9. If it's known that each of the n vertices has exactly (n - 3) one-way-read diagonals to its name, then the n vertices would have a total of n (n - 3) two-way-read diagonals or just n (n - 3)/2 diagonals to name. Free e-mail watchdog. Join Yahoo Answers and get 100 points today. 2 0. serious troll. 1 decade ago. How many distinct diagonals does a hexagon have? The number of diagonals of an n-sided polygon is: n(n − 3) / 2. 8. 5. Boothe. how many lines will be there if we join each pair out of 9 different points. 2 diagonals: An octagon has 20 diagonals: A polygon's diagonals are line segments from one corner to another (but not the edges).