A) \[100{}^\circ ,\,\,80{}^\circ \]
B) \[60{}^\circ ,\,\,\text{7}0{}^\circ \]
C) \[40{}^\circ ,\,\,140{}^\circ \]
D) \[50{}^\circ ,\,\,130{}^\circ \]
Correct Answer: A
Solution :
A/Q, \[\Rightarrow \] \[5x+4x=180{}^\circ \] (by linear pair) \[\Rightarrow \] \[9x=180{}^\circ \] \[\therefore \] \[x=20{}^\circ \] \[\therefore \] \[5x=5\times 20{}^\circ =100{}^\circ \] \[\therefore \] \[4x=4\times 20{}^\circ =80{}^\circ \] Hence \[\angle A={{100}^{o}}\]and \[\angle B={{80}^{o}}\]
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