In which of the following drawings is DE parallel to AC ? 1.
II.
III.
IV.
B
с C
124
12
14
17.5
20.4
A
40
21
D
E
22.5
D
5
22
26
an
B
D 7 4
15
25
B

maximum area = xy = (16)(32) = 512 ft2

to maximize the area of the garden, the side of the fence parallel to the side of the house should be 32 ft long, and the other two sides should both have length 16 ft.'

source

the first one, all those points on the line just make a strait line.