Mathematics
The point P(-3, 12) is reflected in x-axis to point Q. And point Q is then rotated through 180° about origin to point R. Write the co-ordinates of points Q and R.
Symmetry
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Answer
When a point is reflected in x-axis, the sign of its y-coordinate (ordinate) changes.
Reflection of P(-3, 12) in x-axis = Q(-3, -12).
When a point is reflected in origin, the sign of its x-coordinate(abscissa) and y-coordinate (ordinate) both changes.
Reflection of Q(-3, -12) in origin = R(3, 12).
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