Suppose two sides of a triangle have lengths of 13 and 21. What are the possible lengths of the third side, x?

Answer 1

You should use the Triangle Inequalities to find the possible lengths of the third side.

To do this, add the two given side lengths 13+21=34

Find the difference between these lengths 21-13=8

So the third side can take values between these two [8,34]

so if third side is c

8< c < 34