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.
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(i) The fourth foot is at (8, 7). (ii) It depends on light and space. (iii) Width is 2 units, length is 3 units. Height cannot be determined from a 2-D coordinate plane.
With D1 at (9, 0) and R1 at (11.5, 0), the width is 2.5 units (50 cm if 1 unit = 20 cm). This is quite narrow and would not easily accommodate a wheelchair.
The coordinates of point D1 are (9, 0). This means the point is located 9 units to the right of the origin along the x-axis and has no vertical displacement from it.
The door’s distance from the left wall is its x-coordinate, which is 9 units. Its distance from the x-axis is its y-coordinate, which is 0 units as it lies on the horizontal axis.