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There must be 2 of them.
-- The 3 angles inside a triangle always add up to 180 degrees.
-- An obtuse triangle has one angle that's greater than 90 degrees.
-- That leaves less than 90 degrees total for the other 2 angles.
-- So they must be less than 90 degrees apiece.
-- In other words, "acute angles".

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Q: How many acute angles are in an obtuse triangle and why?
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