教甄◆數學題庫

19. Four regular hexagons surround a square with a side length 1, each one sharing an edge with the square, as shown in the figure on the right. The area of the resulting 12-sided outer nonconvex polygon can be written as , where m , n , and p are integers and n is not divisible by the square of any prime. What is m+n+p?Ans: _______。