Look at this diagram which shows four right angles placed next to each other at a point.
Here is one right angle, which is 90°.
Here are two right angles put together, giving an angle of 180°.
2 × 90° = 180°
Here are three right angles put together, giving an angle of 270°.
3 × 90° = 270°
Here are four right angles put together, giving an angle of 360°.
4 × 90° = 360°
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