A histogram differs from a bar chart, as in the former it is the area of the bar that denotes the value, not the height. If classes are not of equal width, then the height of the rectangle is
calculated by the ratio of the frequency of that class, to the width of that class.
Best Study Notes » Maths IX
Postulate refer to an assumption which is taken to be true and then forms the basis of a theory. If two lines are drawn which intersect a third in such a way that the sum of the inner angles on one side is less than two right angles, then the two lines inevitably must intersect each other on that side if extended far enough. This is known as the parallel postulate or the 5 th Postulate given by E
Surface area is the total area of the faces and curved surface of the a solid figure. Hence, a cuboid and cube, both of which have got six faces, will have a surface area which is in a way sum of the areas of each of these faces. Now we know that area of a rectangle is l x b, and that a cube has all sides equal, hence its surface area will be 6 ( l x b) or 6l^2 i.e. 6 times the square of its leng
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