In a triangle there are three sides. In theadjoining figure of a triangle abc we deserve to observe that the variety of trianglescontained = 3 – 2 = 1.

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In a quadrilateral there are four sides.Number of triangles had in a square = 4 – 2 = 2.

In the adjoining figure of a quadrilateralABCD, if diagonal line BD is drawn, the quadrilateral will certainly be split into twotriangles i.e. ∆ABD and also ∆BDC.


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In a pentagon there are five sides. Numberof triangles contained in a pentagon = 5 – 2 = 3.

In the adjoining figure of a pentagonABCDE, on involvement AC and also AD, the given pentagon is divided into three trianglesi.e. ∆ABC, ∆ACD and also ∆ADE.


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In a hexagon there are six sides. Number oftriangles had in a hexagon = 6 – 2 = 4.

In the adjoining figure of a hexagon ABCDEF,on joining AC, ad and AE, the given hexagon is divided into 4 triangles i.e.∆ABC, ∆ACD, ∆ADE and also ∆AEF.


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● Polygons

Polygon and its Classification

Terms related to Polygons

Interior and also Exterior that the Polygon

Convex and Concave Polygons

Regular and also Irregular Polygon

Number the Triangles contained in a Polygon

Angle Sum residential property of a Polygon

Problems on edge Sum residential property of a Polygon

Sum of the interior Angles the a Polygon

Sum that the Exterior angles of a Polygon

7th Grade math Problems 8th Grade math Practice From number of Triangles contained in a Polygon to home PAGE


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● Polygons - Worksheets