cuboid math

Question

Length=9cm
Width=12cm
Surface Area=426cm2
Height=?
Volume=?

Answer 1

surface area of a cuboid is 2[(length *width) +(length*height)+(width*height)]

 so,                    426    = 2[(9*12)+(9*height)+(12*height)]

                          426=2(108+ 21*height)

                          426=   216+ 42*height

                          (426-216) = 42*height

                           210= 42* height

dividing 42 on both the sides

                           5= height

 

so now we have height is 5 cm

 

volume of a cuboid is length*width*height

                               = 9*12*5

                               =540cm³

 

 

Let me know if you have any questions