A and Z are alternate interior angles so 2- = 64° . Using
and fill all the other
opposite supplementary angles ,
we can
we
angles around 2- in .
Using opposite and supplementary angles ,
can fill in all the angles around b. Then 9=1090 ( corresponding
640+710 -1W 180°
angles There's triangle so or w -45 ? This
-
.
now a =
,
,
to 1800-450=135 ?
is supplementary ✗ so ✗ =
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the two lines are parallel .
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We can break the 7- gon up so that its
The
split across
5 triangles .
angles are
the
to 180°, so
angles
in each triangle sum
to 5.1800=9000
the 7- gon sum
in
angles
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quadrilateral
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trapezoid
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parallelogram
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rhombus
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equilateral
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regular
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