A right angled trapezoid would fit this description.
a 3 sided shape is a right angle triangle
an angle with a acute and right angle
A kite shape
Rhombus, trapezoid, parallelogram
a right triangle
cheesse
A right-angle triangle.
2
A square or a rectangle.
any right triangle will have an acute angle in it
no
polygon
A Triangle~!
A right angled pentagon.
A right angled triangle.
A right triangle has three sides and one right angle.