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It is true because a triangle with a right angle and two acute angles is a right angle triangle.
A triangle with 1 right angle and 2 congruent acute angles is both a right triangle and an isosceles triangle.
If all of the angles in a triangle are acute then it is an acute triangle. If one angle is right (or 90 degrees) then it is a right triangle. If one angle is obtuse then it is an obtuse triangle.
In a right angled triangle the two other angles are acute.
In a right angled triangle the two other angles are acute.