One angle in a triangle can be greater than 90 degrees, but no more than one.
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An obtuse triangle has 1 angle greater than a right angle and 2 acute angles. Its 3 interior angles add up to 180 degrees.
Each triangle has 180 degrees on the inside angles.
A triangle equals to 180 degrees
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".
The 3 interior angles of a triangle add up to 180 degrees