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Anonymous
A square or a rectangle.
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a right angle triangle.
A right angle triangle
A Triangle~!
In plane geometry, a shape with four sides, two of which are parallel and have the same length, cannot have a reflex angle.
no
A right-angle triangle.
A square and a rectangle.
rectangle
a triangle
A rectangle or a square: both have four sides and a right-angle of 90 degrees forming the four corners.
a right triangle
A right angled triangle.
a ploygon or quadrilateral