How to know the size of a table by using sql command?

i've got a question that i hope to know a table size by using sqlcommand?
what to do?
thanks in advice,

Select sum(bytes) bytes, sum(blocks) blocks
from dba_segments
where segment_name = 'YOUR_TABLE';This will give you the space in the database allocated to the table. If you want to know the actual space it takes up then you'll have to analyze the table and interrogate the stats using DBA_TABLES.
APC

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select bytes from dba_segments where segment_name='table_name';
But I need to do this for about 4 dozen tables.
Can someone point me along the right corridor?
Thanks.
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11.2.0.1

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