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Distance2 = (21-9)2 + (16-11)2 = 169 and the square root of this is the distance which is 13 units
Points: (23, -33) and (4, 9) Distance: square root of 2125 which is about 46
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The distance formula takes the difference between the two x-coordinates (9-3 = 6) and the difference between the two y-coordinates (-4-7 = -11), then squares these two answers (62 = 36 and (-11)2 = 121), then adds them together (36 + 121 = 157), then takes the square root of this final number. Thus the distance between (9, -4) and (3, 7) is sqrt(157), or about 12.53.