When the programmer wants to allow the user to select any number of choices from a group of one or more independent and nonexclusive choices, the control should be used.

Uhave to get it fixed or buy a new one

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.