a
)
A
triangle
is
a
____________________
-
sided
polygon
.
The
sum
of
a
triangle
is
____________________
.
b
)
A
____________________
is
a
for
-
sided
polygon
.
The
sum
of
the
angles
of
any
quadrilateral
is
____________________
.
c
)
The
sum
of
the
angles
of
a
polygon
with
n
sides
,
where
n
is
____________________
or
____________________
is
(
n
-
2
)
.
180º
.
d
)
As
the
sum
of
the
angles
of
a
regular
polygon
with
n
sides
is
(
n
-
2
)
.
180º
,
and
knowing
that
their
____________________
are
all
the
same
length
and
their
angles
are
all
the
same
,
each
angle
in
a
regular
polygon
is
[
(
n
-
2
)
.
180º
]
/
n
