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###Perl, 42 chars

say$"x9,"*";say$"x(9-$_),"00"x$_,0for 0..8

Output:

 *
 0
 000
 00000
 0000000
 000000000
 00000000000
 0000000000000
 000000000000000
 00000000000000000

The height of the tree can be changed between 1 and 11 rows by replacing the 8 at the end with values from -1 to 9. Going above 11 rows requires also increasing the two 9s earlier in the code, which control how far from the left side of the screen the tree is indented.

Perl, 42 chars

say$"x9,"*";say$"x(9-$_),"00"x$_,0for 0..8

Output:

 *
 0
 000
 00000
 0000000
 000000000
 00000000000
 0000000000000
 000000000000000
 00000000000000000

The height of the tree can be changed between 1 and 11 rows by replacing the 8 at the end with values from -1 to 9. Going above 11 rows requires also increasing the two 9s earlier in the code, which control how far from the left side of the screen the tree is indented.

###Perl, 42 chars

say$"x9,"*";say$"x(9-$_),"00"x$_,0for 0..8

Output:

 *
 0
 000
 00000
 0000000
 000000000
 00000000000
 0000000000000
 000000000000000
 00000000000000000

###Perl, 42 chars

say$"x9,"*";say$"x(9-$_),"00"x$_,0for 0..8

Output:

 *
 0
 000
 00000
 0000000
 000000000
 00000000000
 0000000000000
 000000000000000
 00000000000000000

The height of the tree can be changed between 1 and 11 rows by replacing the 8 at the end with values from -1 to 9. Going above 11 rows requires also increasing the two 9s earlier in the code, which control how far from the left side of the screen the tree is indented.