Answer:
[tex]\theta = 45.[/tex]
Step-by-step explanation:
[tex]applying \: the \: tingle \: rule : \\ \angle( \theta) = 45. \\ this \: is \: a \: right \: angle \: triangle \\ \angle( \theta) + 90 \: + the \: other \: unknown \: angle \: = 180 \\ but \: the \: other \: unknown \: angle \: =\angle( \theta) \\ 2\theta = 180 - 90 \\ 2\theta = 90 \\ \theta = 45.[/tex]
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