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Find all the detailed methods (formulas) to find the distance in high school mathematical geometry.
The distance between a (m, n) and b (s, t) is d = root sign [(m-s) square +(n-t) square].

Distance from point A (m, n) to straight line AX+BY+C = 0d = | Ma+n b+ C |/ root sign (Party A+Party B)

Distance between two parallel straight lines D = | c 1-C2 |/ square A+ square b)

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