Yes because they comply with Pythagoras' theorem.
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No. But they can be the lengths (not leangths!) of the three sides.
With sides of 5 and 12, you can make a triangle with any perimeter you want between 24 and 34. If you call them "legs" because they are the sides of a right triangle, then the hypotenuse is 13, and the perimeter is 30.
If its a right angle it will be 34 units in length because it complies with Pythagoras' theorem.
Doesn't it depend on what type of triangle it is? And which sides you are measuring? And which side it's laying on?
1 Let the sides be x+14 and x 2 So: 0.5*(x+14)*x = 240 which transposes to x2+14x-480 3 Solving the above quadratic equation gives x a positive value of 16 4 Therefore the sides are 30 and 16 5 Using Pythagoras: 302+162 = 1156 and its square root is 34 6 Hypotenuse = 34 cm 7 Perimeter = 34+30+16 = 80 cm