Respuesta :
91 you multiply (2x1)+(2x4)+(2x9)+(2x16)+(2x25)+(2x36)=182,then divide the sum by 2,because they're triangles to get 91.
91 is the answer you multiply (2x1)+(2x4)+(2x9)+(2x16)+(2x25)+(2x36)=182,then divide the sum by 2,because they're triangles to get 91.