Please solve question21

Please solve question21 21. In Fig. 9.22, ZABD = LCDB = ZPQB = 900. If AB = x units, CD = y units and PQ = z units, prove that — + — = — .

Dear Student.

​​​​​​This question is incomplete. ​Please attach the photograph of figure 9.22 or give us the details about the figure so that we can help you out with your query. 
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