SORRY I FORGOT SOME QUESTI IN MY LAST POST!!!

The lengths of two sides of a triangle are given. Describe the possible lenths for the third side.

19.) 5,11
20.) 12,12
21.) 25,10
22.) 6,8

25.) A student draws a triangle with a perimeter 36 cm. The students says that the longest side measures 18 cm. How do you know that the student is incorrect? Explain.