a cube
a 3 sided shape is a right angle triangle
A right angle triangle
an angle with a acute and right angle
A right angle triangle
a right angle triangle.
a right triangle
an obtuse angle
L
A right angle triangle
A right angle triangle
Obviously 90 degrees a right angle is the same in every shape.
If the angle from the base to the highest point is a right angle, it is right. If not, it is oblique.