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A full circle is 360 degrees, half of that, an arc, is 180. Half an arc, or a right angle, is 90 degrees.

Ever heard someone say "Wow, he did a complete 180" when someone changes their mind about something? This is where it comes from. If you are in a circle and turn around to face the exact opposite side of the circle, you have turned 180 degrees.

Anyway, the answer is 90 degrees.

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15y ago

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