Chang knows one side of a triangle is 13 cm. which set of two sides is possible for the lengths of the other two sides of this triangle?
5 cm and 8 cm
6 cm and 7 cm
7 cm and 2 cm
8 cm and 8 cm

For triangle to be possible to draw there is one condition that it needs to suit.
The condition is:
largest side has to be shorter than sum of others 2.

in first case is:
13 = 8+5 which is equal but not greater than 13.

Last case:
13 < 8+8 which means that remaining lenghts are

8 and 8

Solution: = 2 ( 13 + 4 )= 2 ( 17 )= 34hope this ! < 3