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Can it be read from the back row? The rule of thumb is that the type in the projector presentation must be at a minimum of 24pt type to allow everyone in the room to read it.
In addition, the distance from the back row to the screen is the diagonal measurement of the screen times 6. As an example, if you have a 60” diagonal screen (5 feet), then your maximum distance is 30 feet from the screen. Any further from the screen, and you would not see the image well.