What is the angle of Shacos Backstab?

What is the angle of Shacos Backstab? - White Concrete Building

Shaco deals 20% bonus damage when striking a unit from behind with his basic attacks or abilities.

But what exactly does behind mean?

Is it 10/90/180 degrees?

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Scott Webb, cottonbro, cottonbro, Ono Kosuki