One dimension of a rectangular map is 8 inches and the perimeter is 40 inches. what is the other dimension of the map?

In a rectangular figure, the opposite sides should be equal. If one of the sides measures 8 inches, the side opposite to this should also be 8 inches. We let x be the other dimension. The perimeter (P) is equal to, 
                                     P = 2 x 8 + 2x
Substituting the known values, 
                                       40 in = 16 + 2x
Solving for x gives an answer of 12 in. Thus, the other dimension is 12 inches. 

Use a graph site then you will find your answer