A) \[{{5}^{{}^\circ }},{{4}^{{}^\circ }}\]
B) \[{{3}^{{}^\circ }},{{4}^{{}^\circ }}\]
C) \[{{2}^{{}^\circ }},{{1}^{{}^\circ }}\]
D) None of these
Correct Answer: A
Solution :
(a): \[\angle ADB=\angle DBC\] \[\Rightarrow \] \[{{28}^{{}^\circ }}=7y\] \[=y=\frac{{{28}^{{}^\circ }}}{{{7}^{{}^\circ }}}{{4}^{{}^\circ }}\] Also, \[\angle ABD=\angle BDC\] \[\angle 12x={{60}^{{}^\circ }}\Rightarrow x=\frac{{{60}^{{}^\circ }}}{{{12}^{{}^\circ }}}\] \[\Rightarrow \]\[x={{5}^{{}^\circ }}\]
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