Introduction We have learnt that for a closed plane figure, the perimeter is the distance around its boundary and its area is the region covered by it. We found the area and perimeter of various p
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Area of a Polygon We split a quadrilateral into triangles and find its area. Similar methods can be used to find the area of a polygon. Observe the following for a pentagon: (Fig 9.1, 9.2)
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Solid Shapes In your earlier classes you have studied that two dimensional figures can be identified as the faces of three dimensional shapes. Observe the solids which we have discussed so fa
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Surface Area of Cube Imran, Monica and Jaspal are painting a cuboidal, cubical and a cylindrical box respectively of same height (Fig 9.4). They try to determine who has painted more area. H
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Surface Area of Cuboid Suppose you cut open a cuboidal box and lay it flat (Fig 9.15). We can see a net as shown below (Fig 9.16). Write the dimension of each side. You know that a cuboid h
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Cylinders Most of the cylinders we observe are right circular cylinders. For example, a tin, round pillars, tube lights, water pipes etc DO THIS (i) Take a cylindrical can or box and trace t
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Volume of Cube Amount of space occupied by a three dimensional object is called its volume. Try to compare the volume of objects surrounding you. For example, volume of a room is greater than the v
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Cuboid Take 36 cubes of equal size (i.e., length of each cube is same). Arrange them to form a cuboid. You can arrange them in many ways. Observe the following table and fill in the blanks.
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Cylinder We know that volume of a cuboid can be found by finding the product of area of base and its height. Can we find the volume of a cylinder in the same way? Just like cuboid, cylinder
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Volume and Capacity There is not much difference between these two words. (a) Volume refers to the amount of space occupied by an object. (b) Capacity refers to the quantity that a contain
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