Question

What is the formula to find total surface area of the given figure?

Answer 1

Answer:

Starting from surfaces on the right

White area = 4*(2*10)

                  = 4*20

                  = 80

Grey area (including backside) = 2*{(2*2) + (2*4)}

                                                   = 2*(4+8)

                                                   = 2*12

                                                   = 24

Bottom area = 10*4

                     = 40

Total surface area = 80+24+40

                              = 144  [ANSWER]