A right angle triangle
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A triangle can have only one right angle (90o). Such a triangle is called a right triangle.
No, a triangle can have up to one right angle, but it doesn't have to be a right angle in order to be a triangle. A right triangle had one right angle. so, NO
-- No right triangle, acute triangle, or equilateral triangle has an obtuse angle in it. -- If a triangle has an obtuse angle in it, then it's called an obtuse triangle. -- No triangle can have more than one obtuse angle in it .
A right angle triangle.
That's called a "right triangle".