A) \[{{45}^{o}}\]
B) \[{{55}^{o}}\]
C) \[{{60}^{o}}\]
D) \[{{70}^{o}}\]
Correct Answer: B
Solution :
\[\angle ABC=\angle BCD\Rightarrow x=\angle BCD\] But \[\angle BCD=\angle BCE+\angle ECD\] \[\therefore \]\[\angle ABC={{25}^{o}}+{{30}^{o}}={{55}^{o}}\] \[\Rightarrow \]\[{{x}^{o}}={{55}^{o}}\]
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