Maritza draws a rectangle on the coordinate plane and labels the vertices A , B , C , and D . She then reflects the figure across the x -axis to get rectangle A′B′C′D′ . What is the measure of angle D′ in the reflected rectangle?(1 point)

Question

Angle D′ measures
°.

Answer 1

When a figure is reflected across the x-axis, the x-coordinates remain the same and the y-coordinates change sign.

Let's say the coordinates of point D are (x, y).
After reflecting across the x-axis, the coordinates of D' will be (x, -y).

In a rectangle, opposite angles are equal. Therefore, angle D is equal to angle D'.

So, the measure of angle D' is the same as the measure of angle D, which is unknown in this context.