Posted by collins on .
two regular polygons of the same number of sides have sides 5 ft. and 12 ft. in length, respectively. what is the length of the side of another regular polygon of the same number of sides, if its area is equal to the sum of the other two.

Math 
Steve,
The areas are 25k and 144k, for some constant k.
The total area is 169k, so the side length is 13.