The difference to choosing subsets of 2 from a set of 5 is that there are certain combinations that are not allowed. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. You have remembered the first formula correctly: it is n(n-3)/2. A regular pentagon has 5 sides of equal length. A polygon is any shape that has more than three sides. So the number of diagonals is 32C2 - 2 = (32*31/1*2) - 2 = 494 diagonals. (A) 54 (B) 66 (C) 108 (D) 132 (E) 144 The above formula gives us the number of distinct diagonals - that is, the number of actual line segments. In a 12-sided polygon, one vertex does not have any diagonals. If n = 5 then how many diagonals are added with the extra vertex? A polygon of 3 sides (triangle) has 0 diagonals. joining two vertices. It also has 5 vertices of size 108 degrees. Take care when counting the diagonals to count each one only once. So if we look at a triangle.  Thank you for your help. Research source of diagonals = nC2 – n = n(n – 3)/2 = 25*(25 – 3)/2 = 275. You can either leave it at that, or expand using FOIL: (n^2 - 5n + 4)/2. Each point connects to n-3 others (not with itself, or the two adjacent ones), so that's n(n-3) connections. The growth rate in dividends for all three companies is 3 percent. Lv 4. If you are given a picture of the polygon, you can simply count the number of sides. Of those 20 diagonals, 8 are the principal diagonals, the ones joining a pair of opposite vertices . Last Updated: June 16, 2020 Anonymous. Show transcribed image text. EASY. Due to the shape of the triangle, it does not have any diagonals. A diagonal of a polygon is a line segment References b) How many diagonals does a regular septagon have? Mathematics, 21.06.2019 16:00, ramberson101. (A diagonal is a line drawn from one vertex to any other vertex inside the given shape. Add your answer and earn points. For example, a 44-sided polygon would be written as 44-gon. In this case, several readers have written to tell us that this article was helpful to them, earning it our reader-approved status. So here it's a decagon ,that is a 10 sided polygon, So n = 10. Find the number of diagonals in a 15-sided regular polygon. You will see white areas appear. View Answer. Question 365040: A polygon has 44 diagonals.Number of sides = ? It is easy to miscount the diagonals of a polygon when doing it by eye.If you glance quickly at the pentagon on the right, you may be tempted to say that the number of diagonals is 10. Simply plug value of n into the formula , you get: 10*(10-3)/2 = 35. A hexagon has 9 diagonals: there are three diagonals for every three vertices. Answers: 1 Get Other questions on the subject: Mathematics. Each vertex has two other vertexes that are across from it, therefore, two diagonals. ===== Cheers, Stan H The diagonals pass from one vertex to another, so there are 5 diagonals. Answer by ewatrrr(23274) (Show Source): You can put this solution on YOUR website! Past the heptagon, it gets more difficult to count the diagonals because there are so many of them. Hi, *Note: Polygon with n sides has n(n-3)/2 diagonals. I need help with this. of sides of the polygon. If a polygon has (n-1) sides, what are the number of diagonals? There are 17 diagonals. Let's take the nonagon below. What polygon has 20 diagonels? The total number of diagonals of a polygon of n sides is 27. for ex, rectangle has 2 diagonals polygon with 44 diagonals: 44 = n(n-3)/2 solving for n n^2-3n … Number of Diagonals: A diagonal of a polygon is a line segment that joins any two non-adjacent vertices. Example 2: How many diagonals does a polygon with 20 sides have, if one of its vertices does not send any diagonal? For example, a triangle has zero diagonals and a rectangle has two.) A pentagon has five diagonals on the inside of the shape. 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