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"