Perimeter is the total distance around a shape.[br][br]How to find the perimeter of triangle that is missing its side measures:[br][math]a^2+b^2=c^2[/math][br][br]AC and BC = [math]1^2+4^2=c^2[/math] = [math]1+16=c^2[/math] [math]\sqrt{17}=c^2[/math][br]solution: 4.12 or [math]\sqrt{17}[/math][br][br]AB: [math]3^2+3^2=c^2[/math] = [math]9+9=c^2[/math][math]\sqrt{18}=c^2[/math][br]Solution: 4.24 or [math]\sqrt{18}[/math][br][br]Perimeter = 4.12 + 4.12 + 4.24[br]Solution: 12.48