One, if there were anymore, it would have more than three sides.
90 degrees
A right angle triangle can only have one right angle of 90 degrees
acute, obtuse and right angles
The third angle must be 90 degrees so it's a right-angled triangle
Right angled triangle
Yes
kinds of triangle as to angels
A triangle cannot have two right angles. Triangles angles should add up to 180. There are three angles. If there are 2 right angles, there would be no third angle, therefore, no triangle. XD
A triangle can have at most one right angle.
A triangle can have at most one right angle.
A triangle can have at most one right angle.
I do not know about angels but a triangle must have exactly three angles.