Answer:
![18cm<X<56cm](https://img.qammunity.org/2022/formulas/mathematics/college/gzqwu9upahv7yiqsmftrsbq4tuo1l767d2.png)
Explanation:
From the question we are told that
First side 37 cm
Second side 19 cm
Generally considering the triangle inequality theorem we have
![37+19>X\\X+37>19\\X+19>37](https://img.qammunity.org/2022/formulas/mathematics/college/l0se2i7j80jsepx97b7qpx3n5udzo6l7wl.png)
Solving equations we have
![X<56\\X>18\\X>-18](https://img.qammunity.org/2022/formulas/mathematics/college/2sjxs92id2dmovtv981bdz0fruy6zznklm.png)
Generally from the inequalities the range of X is mathematically given as
![X>18\\X<56](https://img.qammunity.org/2022/formulas/mathematics/college/xgr0flwth4pv949o4r44a0dueiueaelzz3.png)
![18cm<X<56cm](https://img.qammunity.org/2022/formulas/mathematics/college/gzqwu9upahv7yiqsmftrsbq4tuo1l767d2.png)
Therefore the range of the Third side is
![18cm<X<56cm](https://img.qammunity.org/2022/formulas/mathematics/college/gzqwu9upahv7yiqsmftrsbq4tuo1l767d2.png)