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A closed rectangular box with a square base is 5 cm in height . if the volume of the box is 45 cubic cm , what is the box surface area in square meter



h=5cm,l=b square base all the side are equal 
volume of a cuboid =l*b*h
                           45  =l*b*5
                            45/5= l^2
                       therefore l=3cm
                          therefore b=3cm
                           total surface area fo a cuboid=2[lb+bh+lh] 
                                                                         =2*39                                                                                                                        =78sqcm
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