A right angled triangle or a trapezium
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A trapezium cannot have one right angle. If it has one it MUST have two.
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a right triangle
cheesse
A right-angle triangle.
2
A right angled triangle.
A right angle triangle
a right triangle
cheesse
A right-angle triangle.
2
no
A square or a rectangle.
any right triangle will have an acute angle in it
A right angled pentagon.
A right angled triangle.
polygon
A Triangle~!