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∴∠QPB=x˚ (∵PQ=BQ)<br>
 
∴∠QPB=x˚ (∵PQ=BQ)<br>
Now Let ∠PAQ=<br>
+
Now Let ∠PAQ=<br>
 +
∠QPA=Y˚ (∵ PQ=AQ)<br>
 +
∴In △PAB<br>
 +
 
 +
∠PAB+∠PBA+∠APB=180˚
    
=problem 3 [Ex-15.2 B.7]=
 
=problem 3 [Ex-15.2 B.7]=

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