A scalene triangle if the acute angles are different in sizes but if the acute angles are equal then it is an isosceles triangle and in both cases all 3 angles must add up to 180 degrees
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An obtuse triangle has 1 obtuse angle and 2 acute angles
An obtuse angle
A right angle triangle has a 90 degree angle and 2 acute angles An obtuse triangle has 1 obtuse angle and 2 acute angles
A trapezoid has two right angles and one obtuse and one acute angle.
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