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Take note that the problem has the statement "the distance around the lens" since lens are usually circular, then the question is finding the PERIMETER of the lens.


               - the lens is a circle                       (we will use 3.1416 as the pi)

               - the diameter of the lens is 102 cm


              - the distance around the lens or the perimeter of the lens



Mathematical Sentence:

                Perimeter of circle = dπ = 102 cm (3.1416)


                         102 cm (3.1416)

                    = 320 . 44 cm (rounded to 2 decimal places

Answer: The distance around the lens is 320.44 cm rounded to 2 decimal places.

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