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Vocabulary Chapter 1

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Across
1
Angles with a sum of 180 degrees.
3
When no vertex or side of a polygon is in the interior.
5
On the same plane.
7
Location. Named by a capital letter.
8
A solid whose bases are circles.
9
Lines that intersect to form right angles.
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An angle that measures exactly 180 degrees.
12
A closed plane figure with 3 or more sides.
14
Angles formed by intersecting lines that do not share a side.
16
A polygon with 7 sides.
17
An angle measuring greater than 90 degrees.
18
Formed by two rays with a common endpoint.
Down
2
A pair of angles that share a side and the non-adjacent sides form a line.
4
Angles with a sum of 90 degrees.
6
An angle measuring less than 90 degrees.
8
Having the same measure.
10
An angle measuring 90 degrees.
12
A flat surface that extends forever in all directions. Named by three non-collinear points or by a capital script letter.
13
Extends forever in 2 directions. Named by two capital letters or a lower case script letter.
15
A polygon with all sides congruent and all angles congruent.