A Polygon is formed by joining three or more line segments and producing the closed figure with the help of the line segments. If we have only three line segments joined to form a figure, we name it as triangle, so a triangle is a polygon, which we say is the closed figure, with three sides, three edges and three vertexes. Here we will learn how to find the area of Triangles. To find the area for triangle, we will first find the Altitude and the base of the triangle. If we know the altitude and the base of the triangle, we say that the area of the triangle is equal to half the product of the base and the altitude. We say that this method of finding the area of the triangle is only possible when we know the height of the triangle. Here in such cases, we take into consideration the triangle which is the half of the quadrilateral. |

**Area of triangle**= one half times the base length times the height of the triangle

**Area of Equilateral Triangle**= $\frac{\sqrt{3}}{4}$ (a

^{2})

**Heron's Formula =**S = $\frac{(a+b+c)}{2}$

**Regular polygon**= ($\frac{1}{2}$) n sin($\frac{360^{0}}{n}$) S

^{2}

when n = number of sides and S = length from Centre to a corner.