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how do you find the exact distance between a line and a point?

Through the process of doing a syllabus based summary, i have come across the point "outline methods by which the resolution and/or the sensitivity of ground-based systems can be improved, including: -adaptive optics -interferometry -active optics" i have been able to answer about the...

have you tried carbon steel tungsten carbide bronze any hardened steel any steel BTW any alloy is metalic cuz an alloy is a combination of a metal and another substance (and i dont even do chem)