16
1 turn = 4 right angles so 5 turns = 20 right angles.
There are nine.
8
Each right angle (90o) has a turn, so the answer is 15 turns. But, as a square can only have 4 right angles, 15 right angles would need to spiral (squarely) like stairs in a tower.
A right angle is a turn of 90 degrees.
12
4 right angles, no other angles.
It has 6 angles, none of which are right angles.
0 right angles
A regular hexagon as no right angles. An irregular hexagon could have from none to as many as five right angles.
a tetrahedron has 3 Right angles
12 right angles.