If a polygon is rotated, which of the following characteristics of the polygon will always be the same?

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?