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What is the skin and mucous membrane? non-specific immunity or specific immunity

My topic for an essay is What type of books you like to read?Why? I'm trying to come up with a thesis statement. Is this a thesis statement? I like to read fiction books.

How are the sides of a right triangle founded having none others sides with < 30,<60 and <90?

How to find sides of a right triangle?

When one length of a right triangle is given how are the other sides found? Given side AB=2radical3 and CB=x.