a right triangle
A four-sided shape with one right angle is a quadrilateral. There is no more specific term, unless it has more than one right angle or has equal sides.
It fits the description of a right angle triangle
There is no name for such a figure. Quadrilaterals such as a trapezium or kite or even one with no equal sides can have a right angle.
What about the other angle(s). You need at least 3 sides and 3 angles to make a closed figure.
a right angle triangle.
A right angle triangle
A right triangle has three sides and one right angle.
a right triangle
A four-sided shape with one right angle is a quadrilateral. There is no more specific term, unless it has more than one right angle or has equal sides.
Five side is always a pentagon, but there's no pentagon that always has exactly one right angle. A regular pentagon has no right angles. An irregular pentagon can have one, two, or three right angles, or none.
It fits the description of a right angle triangle
There is no name for such a figure. Quadrilaterals such as a trapezium or kite or even one with no equal sides can have a right angle.
What about the other angle(s). You need at least 3 sides and 3 angles to make a closed figure.
Draw a square / rectangle, a quadrangle is just a shape with 4 sides, as long as one is a right angle your golden
Not here. It would resemble a chevron.
right angled triangle