rightangle
yes
A right angle turn is a 90 degree turn. Therefore, one ninth of a right angle turn would be a 10 degree turn.
The letter K. It has two acute angles, top and bottom between, the l and < and the inside angle of the < is a rightangle.
hypotenuse
None
by using rightangle triangle
1/360
90 degrees
22.5
a pirouette
a pirouette