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Answer:
[tex] \sqrt{ {a}^{2} + {b}^{2} } \: \: units[/tex]
Step-by-step explanation:
Using distance formula
[tex] \sqrt{ {(0 - b}^{2} + {(b - 0)}^{2} } \\ = \sqrt{ {a}^{2} + {b}^{2} } [/tex]