Step 1: Recall the relationship between the angles and side in triangles.

            NOTE: In a triangle, one side is longer than another if and only if its

            opposite angle is greater than the other's.

Step 2: Calculate the unknown angle in the triangle

              NOTE: Sum of the angles in the triangle = 180

              EXAMPLE:  71 + 60 + x  = 180

                                          x = 180 - 131

                                          x = 49

Step 3: Put the angles in order

          EXAMPLE: \angle I < \angle J < \angle K   

                              49  <  60  <  71

Step 4: Note down the opposite side of the angles in a triangle

          EXAMPLE: Opposite side to the angles  

                                  \angle I = KJ

                                 \angle J = IK

                                 \angle K = IJ

Step 5: Find out the largest side of the triangle by using the side-angle relation.

            NOTE: The angles in order smallest to largest. Their opposite sides are in

                            the same order, from smallest to largest:

            EXAMPLE: \angle I < \angle J < \angle K

                                KJ < IK < IJ

                      So, largest side in the triangle is "IJ"