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In this case they are n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. Any formula that goes by CnH2n+2 is an alkane. There isn't a formula you can use to find out how many isomers there are for any given class of molecules with a specified number of carbons. You just have to think very systematically when you try to find them all.
A hexagon has six sides, and the sum of interior angles of a polygon can be calculated in the formula: #180(n - 2)#, where #n# is the number of sides in the polygon. Since a hexagon has six sides, the sum of interior angles is #180(6-2)=180(4)=720#, so the angle of each side of a hexagon is #720/6=120#. Thus, a hexagon has zero right angles.