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A geometry teacher asked Saul to define “obtuse triangle.” Saul said that an obtuse triangle is a triangle with one interior angle measure greater than 90° and two interior angle measures less than 90°. Is Saul's definition valid?

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salatulmaghrib
It is valid.
The three angles must add up to 180. So, if one is more than 90, the other two have to be less than 90.

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