In △ ABC, ab = 7, AC = 24, BC = 25, then ∠ a=______ Degree

In ∵ △ ABC, ab = 7, AC = 24, BC = 25, ∵ 72 + 242 = 252, that is BC2 = AB2 + ac2, ∵ triangle ABC is a right triangle. ∵ a = 90 °

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