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It is asking for the length of that leg of the triangle. You would use the Pythagorean theorem. So 11^2+12^2=c^2. The answer is he square root of 265.
Need a better picture please so I can help
Answer:
ruler placement postulate is important to define relative positioning between points.
Although both A & C are possible, we don't consider a line to have an "origin". A distance can have an origin, so the answer must be A.
