Adatabase is used instead of a spreadsheet when

            Both spreadsheets and databases, play a part in the daily
    operations of many businesses. While you do not necessarily need to choose between spreadsheets and databases, they are often suited to different types of tasks. Understanding the key differences between spreadsheets and databases is vital if you want to make the best use of either or both of them.
     Spreadsheets and databases share some characteristics, but they involve different technologies.
               Databases generally involve a higher level of technical processing.
-Rosie

Hypothesis: volumes of both figures are equal.the volume of  figure 1 is: .the volume of figure 2 is: .since , you can conclude that and . so, .volumes of figures are equal only when an angle in the basis is right (then figures will be the same), in another cases volume of figure 1 is less than volume of figure 2.the hypothesis was not correct in all cases.