Question

Find the range for the measurement of the third side of a triangle, x, given the measures of the two sides: 6 ft and 13 ft.

Answer 1

The sum of the measures of any two sides of any triangle is greater than the measure of the third side.
so x < 19 ft

Also,
The length of any one side is greater than the difference between the lengths of two given sides.
so x > 7 ft

final answer

7 ft < x < 19 ft