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Surface range and intensiveness of Solids

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24
Surface Area and Volume of Solids
24.1 INTRODUCTION In the previous lesson you have studied nigh cream off figures i.e., figures which completely lie in a plane like squares, 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 After studying this lesson, the learner give be able to : identify different solids explain the means of fold up area of a solid summon the surface area of a cube, cuboid, cylinder, cone, sphere and a hemisphere use the respective formulae. find the area of four walls of a path explain the meaning of volume of a solid find the volume of a cube, cuboid, cylinder, cone, sphere and a hemisphere victimisation respective formulae solve problems from day to day life situations ground on the above concepts. 24.3 EXPECTED BACKGROUND KNOWLEDGE Area of plane and rectilinear figures Circumference and area of a circle Four fundamental operations on numbers 24.4. inviolable FIGURES In Fig 24(i), we have a base piece in the form as shown. It is a plane figure.





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But when we fold the paper along the dotted lines, we can adjudge a box (like a chalk box) as shown in Fig 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 occupy space (i.e., they 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, geometrical box, match box and a...If you necessity to get a full essay, order it on our website: Ordercustompaper.com



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