describe its leaves?
They are typically long and wide with 3-5 palmate lobes with a serrated margin. The sinuses are typically narrow, but the leaves can exhibit considerable variation. When five lobes are present, the three at the terminal end are larger than the other two near the base.
Acer rubrum
They are typically long and wide with 3-5 palmate lobes with a serrated margin. The sinuses are typically narrow, but the leaves can exhibit considerable variation. When five lobes are present, the three at the terminal end are larger than the other two near the base. 
the red maple is also known as acer rubrum. its scientific name is Yes, the scientific name of red maple is Acer rubrum. is it a tree? Yes, a medium to large sized tree. where is its found? In eastern North America. how big does it grow? It is a medium to large sized tree. is this tree only found in america? No, it is also cultivated in United Kingdom. do you know in which states in america? Nova Scotia, Minnesota, Wisconsin , Illinois, Missouri and others. and in the u.k.? UNANSWERABLE
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Acer rubrum [SEP] Description
They are typically long and wide with 3-5 palmate lobes with a serrated margin. The sinuses are typically narrow, but the leaves can exhibit considerable variation. When five lobes are present, the three at the terminal end are larger than the other two near the base. In contrast, the leaves of the related silver maple, "A. saccharinum", are much more deeply lobed, more sharply toothed and characteristically have 5 lobes. The upper side of "A. rubrum"'s leaf is light green and the underside is whitish and can be either glaucous or hairy. The leaf stalks are usually red and are up to long.