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A right angle triangle
a right triangle
an obtuse angle
An obtuse triangle.
An example is an A4 sheet of paper. There is a right-angle in each corner, 4 right-angle in total. So, basically, an angle in a shape is a change of direction.
a 3 sided shape is a right angle triangle
A right angle triangle
an angle with a acute and right angle
A right angle triangle
a right angle triangle.
a right triangle
an obtuse angle
L
a cube
A right angle triangle
there sizes angle points and shape
A kite or a trapezium can.