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When I reset my memory I lose the GEOMETRY mode of my 9860.

Some of the reset options on the 9860-series of graphics calculators will result in the deletion of all Add-Ins. This includes the GEOMETRY mode, which is a pre-installed Add-In on the CASIO fx-9860G AU PLUS (and can also be installed on the fx-9860G AU).

To avoid this result, do not use RESET:Add-In, RESET:Add-In&Storage or RESET:Initialise All.

To clear all memeory content except the Add-Ins, use RESET:Main&Storage.

If the Geometry Add-In has already been deleted, refer to the pdf provided for instructions on downloading the GEOMETRY Add-In file and installing it on a handheld 9860.