It depends on the angle between the two lines. You can make the third side approach zero length or approach an infinite length. Take two pencils and hold them together at the ends to make a "V" out of them. Open the V up a bit and then close it up a bit. See how it works? You can vary the angle between the two line segments, and this will vary the length of the length of the third segment.
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The length of the third side of an equilateral triangle is the same as the lengths of both of the other two sides.
An isosceles triangle has two sides with equal measures. The third side can be any length.
100 - (2 x 36) = 28 cm
The sum of the two shorter sides of a triangle must be longer than the third. Thus the third side can be any length greater than 0 and less than 20. Examples are 0.5, 2, 5, 10, 15, 17.5, 19.9.
To find the perimeter of a triangle, you need to add the lengths of all three sides. If two sides of the triangle are 6 and 5 units long, you still need to know the length of the third side to find the perimeter. Without the length of the third side, it is not possible to calculate the perimeter of the triangle.