... may be acute, right, or obtuse.
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A triangle has at two acute angles and the third angle is either an acute angle, a right angle or an obtuse angle.
There are two equal acute angles. The third angle can be acute, right or obtuse.
No. In fact, if one of the angles is not acute (a right angle or obtuse), the other two must be acute.
Not necessarily. The two equal angles in an isosceles triangle must both be acute angles. If they were right angles or obtuse angles then a triangle could not be formed. If the two equal angles are less than 45° each then the third angle is an obtuse angle. If they are both 45° then the third angle is a right angle and if they are both greater than 45° then the third angle is an acute angle.
Yes and the third angle would be 100 degrees