Size of tables

Hello,
I am new to oracle. I need to find the size of all the tables in a schema. How can I go about doing that? I can do it thru TOAD but that will take me a long time. Any1 have an idea or maybe even a script I can use?
Thanks in advance

OK that works!! Is there another way I can do it if I am logged in as sys or system but I wanna see another schema's tables?
Thanks for the all your help

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    ==================================================================
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