exam Maths Puzzle Numerical Ability

A college survey was taken to determine where students study. Of 107 students surveyed, 67 studied in the library, 55 studied in the student union, 21 studied in both the library a

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I am not sure if I need a formula or not, but I am trying to figure out the dimensions of each side of a 9 foot by 9 foot octagon. Any help would be greatly appreciated. Thank yo Find the surface area of a cone with height of 21 cm. and radius of 21cm. Express the answer in terms of pie.