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A farmer wants to fence off his four-sided plot of flat land. He measures the first three sides, shown as A, B, and C in Figure 16, and then correctly calculates the length and orientation of the fourth side D. What is his result?

D = ? km
D
A
y A+B+C+D=0
C
?
7.5°
= 4.70 km
C = 3.02 km
19°
A
Figure 16.
B
16°
W
N
S
X
B = 2.48 km
E

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