This is known as a decagon.
				
									
													Heptagon sum of interior angles. 
						
													Now the sum of the interior angles of one triangle is 180 degrees. 
													In general the interior angles of a polygon with n vertices is n 2180 degrees. 
													You get 7 2 1800 or 5 1800 9000. 
													Learn how to determine the sum of interior angles of a polygon. 
											
									
						
													For any n sided figure you can find out the sum of interior angles by a formula. 
													Since you know that this sum is 1440 degrees you can substitute this into the formula and solve for n the number of sides. 
													A heptagon has 7 sides. 
													So to calculate the sum of the measures of the interior angles in a heptagon substitute 7 for n in n 2 1800. 
											
									
						
													The interior angles of a triangle add up to 1800. 
													So to calculate the sum of the measures of the interior angles in a heptagon substitute 7 for n in n 2 1800. 
													A polygon is a plane shape bounded by a finite chain of straight lines. 
													In general the interior angles of a polygon with n vertices is n 2180 degrees. 
											
									
						
													To find the measure of the interior angles we know that the sum of all the angles is 900 degrees from above. 
													All sides are the same length congruent and all interior angles are the same size congruent. 
													The regular polygon has 10 sides. 
													And there are seven angles. 
											
									
						
													So the measure of the interior angle of a regular heptagon is about 12857 degrees. 
													So for 5 triangles you get 5180 900 degrees. 
													You get 7 2 1800 or 5 1800 9000. 
													Interior angles of polygons an interior angle is an angle inside a shape. 
											
									
						
													A heptagon has 7 sides. 
													Now the sum of the interior angles of one triangle is 180 degrees. 
													A regular polygon is a polygon whose sides are congruent. 
											
							  
		  
			
												 
						
							 
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