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Answer: D(-2, -4)

All you have to do in this situation is make your answer negative, because they will both be going to the negative side. This also would be the same thing for if they are already negative you turn them positive.

The point (2, 4) is in the first quadrant then they will fall in the third quadrant. Then the point will be (-2, -4)

What is coordinate geometry?

Coordinate geometry is the study of geometry using the points in space. Using this, it is possible to find the distance between the points, the dividing line is m:n ratio, finding the mid-point of line, etc.  

Point D(2, 4) is rotated 180° about the origin.

If the point is rotated by 180 degrees then it will fall in the opposite quadrant.  

The point (2, 4) is in the first quadrant then they will fall in the third quadrant.

And we know that the point will be negative.

Then the point will be (-2, -4)

More about the coordinate geometry link is given below.

https://brainly.com/question/1601567