<XYZ =90°(ANGLE ON THE SEMI-CIRCLE)
MEANING
NOW WE HAVE 1 UNKNOWN <XZY
<XYZ+<YXZ+<XZY=180°(SUM OF ANGLES OF A TRIANGLE)
90°+88°+<XZY=180°
<XZY=180°-90°-28°
<XZY=62°
BE ALERT I USED THE WRONG ANGLE OF <YXZ BECAUSE IT WAS UNCLEAR IN THE PICTURE BUT WITH WHAT I WROTE YOU WILL BE ABLE TO PLUG IN CORRECT VALUE OF THE ANGLE!!AND FIND THE CORRECT ANSWER.