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1 turn = 4 right angles so 5 turns = 20 right angles.
If you walked the perimeter of a square building, you would turn 4 times - with one right angle at each corner. If you simply rotated on the spot, there would not be any right angles as you would be turning through 360 degrees.
There are 180 degrees in half a turn which is the equivalent of 2 right angles.
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A right angle is a turn of 90 degrees.