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 right angle = 90o angle. So, number of right angles in a 720o shape = 720 / 90 = 8.
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
A kite or a trapezium can.