It would help if the question was less obscure. What do you mean by "work"? How the surface area affects chemical processes (for example the surface area of catalysts), or diffusion, or surface areas and friction?
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You will have to work the surface area of one of the ends and then multiply that with the length.
Form a net of the Toblerone and work out the area of each individual part of it and then add up the parts together to find its entire surface area
work it out
Work out the area of each of the 5 nets and then add them together
It is the surface area of the two ends plus the surface area of the curved surface. Surface area of each end is pir2 Surface area of the curved surface is 2pirh Total surface area = 2pir2 + 2pirh