no
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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
No that would be impossible but it can have 2 acute angles and 1 right angle which would be a right angle triangle
An obtuse triangle or a right angle triangle. An equilateral is definitely an isoceles triangle * * * * * Not true. An obtuse or right angled triangles can be isosceles. It depends on the sizes of the two smaller angles. An isosceles triangle has two equal angles so a triangle with angles of size [A, (180-A)/2, (180-A)/2] degrees where 90 < A < 180 degrees would be an obtuse angled isosceles triangle. A triangle with angles of size (90, 45, 45) degrees is a right angled isosceles triangle.
A scalene triangle has 3 unequal acute interior angles An obtuse triangle has 1 obtuse and 2 unequal interior angles