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Mathematics
Mathematics
Problem
In a regular hexagon
A
B
C
D
E
F
ABCDEF
A
B
C
D
E
F
, prove that
A
B
+
A
C
+
A
D
+
A
E
+
A
F
=
3
A
D
\mathbf{AB} + \mathbf{AC} + \mathbf{AD} + \mathbf{AE} + \mathbf{AF} = 3\mathbf{AD}
AB
+
AC
+
AD
+
AE
+
AF
=
3
AD
.
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