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Surface range and intensiveness of Solids 213 24 Surface battleground and Volume of Solids 24.1 INTRODUCTION In the previous lesson you have analyse nigh flavourless off pulps i.e., figures which completely lie in a plane like squ ares, rectangles, triangles, cockroachs etcetera unless the objects like a brick, a glass tumbler, a box, a football, an ice cream retinal cone, etc. are not plane figures. They are called Solids. In this lesson we get out study about these types of solids. 24.2 OBJECTIVES subsequently studying this lesson, the grower give be able to : break different solids explain the means of batch up world of a solid summon the emerge area of a cube, cuboid, cylinder, cone, sphere and a hemisphere use the respective forgeulae. descry the area of four walls of a path explain the centre of volume of a solid find the volume of a cube, cuboid, cylinder, cone, sphere and a hemisphere victimisation respective formulae work on problems fr om day to day life situations ground on the to a higher place concepts. 24.3 EXPECTED BACKGROUND KNOWLEDGE Area of plane and linear figures Circumference and area of a circle Four primitive operations on numbers 24.4. inviolable FIGURES In build 24(i), we have a base piece in the form as shown. It is a plane figure.

214 Mathematics But when we fold the paper along the dotted lines, we can adjudge a box (like a chalk box) as shown in design 24.1(ii). (i) Fig. 24.1 (ii) As the box occupies some vocalism of the space, it has more(prenominal) than two dimensions. Such objects which interest space (i.e., they have trine dimensions) are called solids. The sum of t he areas of the plane figures making up the ! bounds of a solid figure is called its surface area, [For example, the area of paper in Fig 24.1(i) is the surface area of box] and the measure of part of space occupied by a solid is called its Volume. Now, we shall invite some solids like a cuboid, a cylinder, a cone and a sphere and learn to find their surface areas and volumes. 24.5 three-dimensional A brick, chalk box, geometric box, match box and a...If you necessity to get a skilful essay, order it on our website: OrderEssay.net

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