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Mathematics
Mathematics
Problem
Let
A
B
C
D
E
F
ABCDEF
A
B
C
D
E
F
be a regular hexagon. If
A
D
⃗
=
x
B
C
⃗
\vec{AD} = x\vec{BC}
A
D
=
x
B
C
and
C
F
⃗
=
y
A
B
⃗
\vec{CF} = y\vec{AB}
C
F
=
y
A
B
, then
x
y
=
xy =
x
y
=
(1) 4 (2)
−
4
-4
−
4
(3) 2 (4)
−
2
-2
−
2
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