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Question

Find x in the following figure:


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Solution

In ADC,
AD = AC (given)
ADC=ACD ( angles opposite to equal sides are equal)
ADC=42
(ACD=42(given))
ADC=DAB+DBA (Exterior angle property of a triangle)
But, BD=DA (given)
DAB=DBA ( angles opposite to equal sides are equal)
ADC=2DBA
2DBA=42
DBA=21
Now, x=CBA+BCA (Exterior angle property of a triangle)
x=21+42 (CBA=DBA=21 and BCA=42 (given))
x=63

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