A right angle triangle
A 90o angle is a right angle, and a triangle with a right angle is called a right triangle.
An Obtuse Triangle
a 90 degree triangle
east
a right triangle it's called this because it has a right angle.
A 90o angle is also called a Right Angle, so a triangle that has one 90o angle is a Right angle triangle.
That's the triangle's "hypotenuse".
Because the Bottom left corner makes a 90 degree angle like this |_ and a 90 degree angle is called a Right angle thus the name Right angled Triangle
A right(-angled) triangle
The longest side of a right angle triangle is the hypotenuse and it is opposite the 90 degree angle.
a right triangle
The supplementary angle of the triangle.