- What are the possible positions of a three mutually tangent circles? I have four now?

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In this case must "a" and "c" be equal to each other also?. I know that "a+c"must be equal to "b"? Please help me Calculate Q for phase changes for some or all of these questions? When I went to the hospital recently they did a poct test on me what for ?And how do I find out the results? How would I go about completing the square for T in this problem? Can Ghosts appear in a photo then dissappear?