The document Points to Remember- Visualising Solid Shapes Class 8 Notes | EduRev is a part of the Class 8 Course Class 8 Mathematics by Full Circle.

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**Points to Remember**** **

• Perspective is the art of representing solid objects on a flat surface to show its height, width, distance, etc.

• 3-D bodies have different views from different positions.

• For a polyhedron,

F + V – E = 2

where ‘F’ stands for number of faces,

‘V’ stands for number of vertices and

‘E’ stands for number of edges.

• The relation F + V – E = 2 is called Euler’s formula.**WE KNOW THAT**

Plane shapes have two dimensions (measurements) like length and breadth. That is why they are called two dimensional (2-D) shapes. On the other hand, a solid object having three dimensions like length, breadth, height (or depth) is called 3-D object. Triangles, rectangles, circles, trapeziums, etc. are 2-D Figures while cuboids, cubes, cylinders, spheres, etc. are 3-D objects.

A solid is bounded by one or more surface and it always occupies some space. Its surface (or face) can be a plane or a curved surface. When any two faces of a solid meet together, we get a line segment called an edge. When three more faces of a solid meet at one point, then the point is called a vertex of the solid.

Note:Perspective is an art of representing solid objects on f lat surfaces to convey the impression of distance, depth, width and height, using oblique lines and shading.

**Solved Example****Q1: Which of the following is true for a polyhedron?1. Polyhedrons are 3D figures.**

Solution:

Move from the library towards the north and take a right turn from the locality and go straight passing from the primary school, fire station and City Park. In the front of the lake is our bus depot.**Q3. Which is further east, the city park or the market? Solution: **Between the market and the city park, the city park is further east.

93 docs|16 tests

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