Answer:
(1, 3)
Step-by-step explanation:
If quadrilateral ABCD is reflected across the line y = x, then the x- and y-coordinates get reversed. Since the coordinates of point D are (3, 1), then the coordinates of point D' are (1, 3).
Perimeter- add all sides together
8+8+5+5
26
1800
LCM of 10 and 15 = 30
LCM of 6 and 20 = 60
30(60) = 1800
