Find the largest side of the triangle

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"