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It is impossible for a triangle to have one or no acute angles because all three angles must add up to 180 degrees.

If only one angle was acute, the other two angles would be required to be obtuse or right angles, and any combination of these other two angles would add up to 180 degrees or higher (minimum two right angles). For this reason, it is possible to only have one obtuse angle or one right angle in any triangle, making the other two angles acute by definition.

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14y ago

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