Short term memory and long term memory?

when you say short term memory and long term memory it does not referring to how much memory the mind can store but how long the mind can hold or remember that information.For example you have two friend in your class then your teacher discuss a topic in math both of them understand the topic but the other one the next day forget on how it is done he is the one with the short term memory.In regards with your question i think the one with the short term memory will only remember the information that the shape has 4 edges while the one with the long memory will remember all the info about it