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Do it in PHP language: //assuming elevation = 0 $earthR = 6371; // in km ( = 3959 in miles) $LatA = 37.418436; $LonA = -121.963477; $DistA = 0.265710701754; $LatB = 37.417243; $LonB = -121.961889; $DistB = 0.234592423446; $LatC = 37.418692; $LonC = -121.960194; $DistC = 0.0548954278262; /* #using authalic sphere #if using an ellipsoid this step is ...



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