A) \[20{}^\circ \]and \[70{}^\circ \]
B) \[45{}^\circ \] and \[90{}^\circ \]
C) \[30{}^\circ \]and \[90{}^\circ \]
D) \[45{}^\circ \]and \[105{}^\circ \]
Correct Answer: B
Solution :
(b): Case \[1:30{}^\circ \] can be equal \[\angle le,\Rightarrow \angle les\] are \[30{}^\circ ,30{}^\circ ,120{}^\circ \] then, difference \[=120{}^\circ -30{}^\circ =90{}^\circ \] Case \[2:30{}^\circ \] is not equal \[\angle le;\,\,\Rightarrow \angle les\] are \[30,75{}^\circ ,75{}^\circ ,\] then, difference \[=75{}^\circ -30{}^\circ =45{}^\circ \]
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