Evaluate
step
1
2
3
4
A
B
C
D
E
F
G
Given
the
triangle
△
ABC
,
where
D
,
E
,
and
F
are
the
midpoints
and
G
is
the
centroid
.
Click
button
2
to
go
to
next
step
.
Drag
B
to
change
the
shape
of
the
triangle
.