- The spherical surface of space which defines the "surface" of a black hole is the - -?

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IN a triangle if lines are drawn parrallel to the base.The distance between each line is x.Then prove that their lenghts are in ap? Can Balamuthia Mandrasillas live in Northern regions/ demic regions? Does purified water have fluoride in it? Square root of 5.10 = 1.000+x/1.000-x
I know the answer is 0.3861 I just don't know the steps to getting this answer. Please help.? Safer construction practices for tsunami.?