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C = 100. So CC = 200. L = 50. So CCXL = 240. II = 2. So CCXLII = 242.
prime factorize: 242 /\ 2 121 /\ 11 11 8 /\ 2 4 /\ 2 2 so, 242=2*11*11 and 8=2*2*2 2*2*2*2*11*11=1936 (proof: if you multiply 242 and 8, you'll also get 1936)
You have a right angle triangle so use Pythagoras' theorem to find the length of the other side (the hypotenuse) 242+242 = 1152. The square root of 1152 = 33.9411255 inches. So your answer is 34 inches correct to two significant figures.
Assuming you mean an area equal to 170 x 242 square centimetres, the units you will be looking to convert to are square inches, not merely inches.Multiplying 170 and 242 gives us 170 x 242 = 41140 square centimetres.There are 2.54 x 2.54 = 6.4516 square centimetres in one square inch.Therefore, 41140 / 6.4516 is equal to 6376.71 square inches.