Class 6 Maths Understanding Elementary Shapes | Introduction |

__Introduction__

We see many shapes around us which are made of lines or curves. These shapes have corners, edges, planes, open curves and closed curves. We can organize then into line segments, angles, triangles, polygons and circles having different sizes and measures. In this chapter, we will study about these shapes and find the different characterizes of these shapes.

**Different types of curves and shapes:**

A line segment is a part of a line that is bounded by two distinct end points and contains every point on the line between its endpoints.

A triangle is a polygon with three edges and three vertices. A triangle with vertices A, B, and C is denoted by Δ ABC.

A circle is a simple closed shape. It is the set of all points in a plane that are at a given distance from a given point known as the centre. The distance between any of the points and the centre is called the radius.

A quadrilateral is a polygon with four edges (or sides) and four vertices or corners. Different types of quadrilaterals are square, rectangle, rhombus, kite, parallelogram, etc.

A cuboid is a 3D shape. Cuboids have six faces, 8 corners or vertices and 12 edges which form a convex polyhedron. A cuboid that uses all square faces is a cube.

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