meaning in context - Right or left? When the teacher says: "If you look at the diagram on the left hand side, you will solve this question!"(In a position like this?)

● Right or left? When the teacher says:

"If you look at the diagram on the left hand side, you will solve this question!"

Is it the teacher's left hand side or students' left hand side?

Imagine, you are in a position like this:

Where is right? Where is left? (You can use the colours).

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The example I have in mind is this Cardiac Muscle: Function & Main Parts – Histology | Lecturio. There is a speaker off-screen. Referring to this image, he says

And cardiac muscle has structures called intercalated disks, which if you look at the diagram on the left-hand side, it explains what these intercalacted disks actually are and what their functional role is.

Answer

When somebody is standing in front of a crowd and they say left or right, it's almost always in reference to the perspective of the crowd that is being addressed.

A teacher may turn and point to the blackboard, indicated something to the left or right as they are now facing.

In theatre, if an actor or director wants to talk about things from the perspective of people on the stage facing the audience, they use the phrases stage left and stage right (from Merriam-Webster). Note that that is not spoken to the audience; it's for stage direction behind the scenes and during rehearsals. The audience uses the normal words.

So, the assumption is normally the perspective of the audience.

But if it's unclear, clarifying language can be used.