The percent of decrease is the amount it has decreased by. 49-28 is 21, so set up 21/49 to x/100. Cross multiply to get 2100 = 49x, then divide both sides by 49. From this you get about 42.857, so the percent of decrease is 42.857%.
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-30.6122%
87.5 is less so it must be a decrease!
49 square centimetres.
Area = 49 cm2 so side = sqrt(49) cm = 7 cm and therefore, perimeter = 4*side = 28 cm.
7*7 = 49 square cm