Pentagon Shape | 5 Sided Polygon | скачать в хорошем качестве

Pentagon Shape | 5 Sided Polygon |

In this video you will learn about the 5 sided polygon called a Pentagon. A pentagon is a 5 sided polygon A polygon is a closed 2D shape with straight lines. Circles and shapes that include curves are not polygons A regular pentagon has 5 equal sides and 5 equal angles. The general formula for the sum of all interior angles of a polygon (n-2)180 n = the number of sides (5-2) = 3 x 180 = 540 The degree measure of the interior angles equals sum of all interior angles divided by the number of sides 540/5 = 108 The measures of the central angle equals 360/5 = 72 A pentagon has 5 diagonals You can Find the number of diagonals by using, n (n - 3) / 2 n = number vertices 5(5-3 )/2= 5 times 2 =10/2=5 Area If the apothem is known area = ½ perimeter times apothem If you do not know the Apothem length then not find the apothem using Apothem = side/ 2Tan ( 180/number sides) Once you know Apothem then use ½ Perimeter times Apothem Pentagons can also be irregular which means the shape does not have equal sides or angles