Yes, by using the Baudhāyana-Pythagoras Theorem. The distance AD is the hypotenuse of a right-angled triangle. AD = square root of (4 squared plus 3 squared), which equals 5 units.
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In a reflection across an axis, the shape, size and the coordinate corresponding to that axis remain the same. However, the sign of the other coordinate and the orientation (right-to-left) change.