Step 1: Recall angle theorem/properties of inscribed quadrilaterals in circle.



Step 2: Note down given values and examine the figure

Step 3: Identify the suitable theorem/property for the given question.

            EXAMPLE:  Opposite angles in an inscribed quadrilateral  

                                are supplementary.

                      [math] \angle L + \angle J = 180\degree

Step 4: Use the theorem/property to find the unknown value.         

             EXAMPLE: From triangle ABC

                                    \angle L+\angle J\ =180\degree

                                    107\degree+\angle L=180

                                    \angle L=180\degree-107\degree

                                    \angle L=73\degree