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NCERT 5th Class (CBSE) Mathematics: Polygons And Circles

A polygon is a simple figure formed by connecting line segments. These line segments do not cross each other. Triangles and quadrilaterals (rectangles, squares, etc.) are examples of polygons.

TRIANGLES

The word triangle means three angles. The given triangle has three angles ∠A, ∠B and ∠C. Points A, B and C are the vertices of triangle ABC. The sides of the triangle are AB, BC and CA.

Triangles -1

Triangles can be classified:

Triangles can be classified

QUADRILATERALS

A quadrilateral is a closed shape with 4 straight sides.

Quadrilaterals

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