One angle (corner) must to 90 degrees.
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An acute angled triangle, right angled triangle or obtuse angled triangle.
a scalene can be a right-angled triangle or a obtuse angled triangle or a acute angled triangle depending on the angles of the triangle.
acute angled triangle,right angled triangle,obtuse angled triangle,isosceles triangle,equilateral triangle, scalene triangle
a right angled triangle is special because it is the only triangle that has a right angle with a dregree of 180.
The right-angled triangle.