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Nouri
Hi there!

I'm going to assume you either mean a 90 ° turn or full 360 ° turn. 

For a 90 ° turn you would simply need three 30 ° angles as 30 * 3 = 90.

For a 360 ° turn you would need twelve 30 ° angles as 30 * 12 = 360.
apologiabiology
full turn
either you means a 180 degrees which is a direct U-turn
or 360 degrees turn which is 1 full rotation

so

how many 30's make full turn
x times 30=full turn
divide both sides by 30
x=full turn/30
therefor we just divide by 30 to find how many of them are needed
180/30=6
6 turns if 1 full turn is 180


360/30=12
12 turns if 1 full turn is 360

I would go with 12 turns