If it is a flat umbrella (as if you're looking at it on a paper) then only one - split down the middle vertically.
But if you are looking at a real umbrella, then it has an infinite amount of lines of symmetry because you can go all the way around.
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10 lines of symmetry
2 lines of symmetry
There are infinitely many lines of symmetry. Every line can be a line of symmetry for a suitable shape.
A TRAPIZOID has 2 lines of symmetry
There are eight lines of symmetry.