They are right angles
right angle
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 parallelogram with a right angle is a rectangle.
It is called a right angle.
Assuming your question is what makes a right-angle, it is an angle of 90o .
A right triangle is one that has a right angle.
It is not and so the question makes no sense!
A total of 90 degrees makes up a right angle.
Right triangles have two acute angles, but that doesn't make them right. Having a right angle makes them right.
Three right angles, where one of the "arms" of the angle curves inwards which makes the angle appear less than a right angle.
They are right angles
right angle
perpendicular.... it makes a right angle
A right(-angled) triangle
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 parallelogram with a right angle is a rectangle.