Why the following solids are not polyhedron?(i) A sphere.(ii)

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Visualising Solid Shapes

Short Answer Type

31. A polyhedron has 4 faces and 6 edges. Find the number of its vertices.

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32. A polyhedron has 5 faces and 6 vertices. How many edges will it have?

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Long Answer Type

33. Define the following:
(i) Polyhedron (ii) Prism (iii) Pyramid

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Short Answer Type

34. What is a polyhedra?

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35. What is a tetrahedron?

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36. What is a parallelopiped?

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Long Answer Type

37. Which of the following solids are not polyhedrons?

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Short Answer Type

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38. Why the following solids are not polyhedron?
(i) A sphere.
(ii) A cone.
(iii) A cylinder.

Since, a polyhedron is a solid shape bounded by polygons. However, (i) a sphere, (ii) a cone and (iii) a cylinder are not polyhedron because they are made of polygons, i.e. their faces are not polygons.

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39. Name the following polyhedron.

How many faces, vertiecs and edges of this solid are there?

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40. What Euler’s formula? Verify the Euler’s formula for a pentagonal prism.

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