Yes. A triangle can have only one obtuse angle. The other two angles will always be acute.
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A right angle triangle has a 90 degree angle and 2 acute angles An obtuse triangle has 1 obtuse angle and 2 acute angles
An obtuse triangle has 1 obtuse angle and 2 acute angles
Yes. Every triangle with an obtuse angle must have two acute angles.
A triangle has at two acute angles and the third angle is either an acute angle, a right angle or an obtuse angle.
A right triangle has one angle a right angle (90o) An obtuse triangle has one angle an obtuse angle (> 90o) An acute triangle has all angles acute (< 90o)