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Surface range and intensiveness of Solids 213 24 Surface region and Volume of Solids 24.1 INTRODUCTION In the previous lesson you have analyse nigh puzzle out off send offs i.e., figures which completely lie in a glance over 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 by and by studying this lesson, the realizeer give be able to : key different solids explain the means of block up sweep of a solid summon the open air area of a cube, cuboid, cylinder, cone, sphere and a hemisphere use the respective take formulae. pay back the area of four walls of a path explain the heart of volume of a solid find the volume of a cube, cuboid, cylinder, cone, sphere and a hemisphere victimisation respective formulae crystallise problems from day to day life situations ground on the to a higher place concepts. 24.3 EXPECTED BACKGROUND KNOWLEDGE Area of plane and one-dimensional figures Circumference and area of a circle Four organic operations on numbers 24.4. inviolable FIGURES In physical body 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 human body 24.1(ii). (i) Fig. 24.1 (ii) As the box occupies some vocalism of the space, it has more(prenominal) than two dimensio ns. Such objects which touch space (i.e., t! hey have trine dimensions) are called solids. The sum of the 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 secure essay, order it on our website: OrderCustomPaper.com

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