Points, Lines, Rays, Angles

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Last updated 2:01 PM on 9/24/26
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29 Terms

1
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point

A "dot" on a line that shows exact location.

<p>A "dot" on a line that shows exact location.</p>
2
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line

A straight path of points that continues forever in both directions. There is an arrow on each end to show that it continues on and on.

<p>A straight path of points that continues forever in both directions. There is an arrow on each end to show that it continues on and on.</p>
3
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line segment

A part of a line. There is an endpoint on each end of the segment.

<p>A part of a line. There is an endpoint on each end of the segment.</p>
4
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ray

a part of a line that has one endpoint and one arrow. It begins at the end and continues forever in one direction only.

<p>a part of a line that has one endpoint and one arrow. It begins at the end and continues forever in one direction only.</p>
5
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horizontal

a line, or segment, or ray that goes straight ACROSS - (like east to west)

<p>a line, or segment, or ray that goes straight ACROSS - (like east to west)</p>
6
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vertical

a line, or segment, or ray that goes straight UP AND DOWN -( like north to south)

<p>a line, or segment, or ray that goes straight UP AND DOWN -( like north to south)</p>
7
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parallel lines

2 or more lines that are ALWAYS the same distance apart from each other and never cross

<p>2 or more lines that are ALWAYS the same distance apart from each other and never cross</p>
8
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intersecting lines

2 or more lines that DO cross at some point

<p>2 or more lines that DO cross at some point</p>
9
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perpendicular lines

2 or more lines that cross (intersect) in a special way. Where they cross forms a SQUARE CORNER - or right angle (90 ).

<p>2 or more lines that cross (intersect) in a special way. Where they cross forms a SQUARE CORNER - or right angle (90 ).</p>
10
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vertex

the endpoint where 2 rays meet to form an angle

<p>the endpoint where 2 rays meet to form an angle</p>
11
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angle

a SHAPE formed by 2 rays that share the same endpoint

<p>a SHAPE formed by 2 rays that share the same endpoint</p>
12
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right angle

an angle that (opens up) - EXACTLY 90 degrees. There is a "square" corner.

<p>an angle that (opens up) - EXACTLY 90 degrees. There is a "square" corner.</p>
13
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acute angle

an angle that opens up LESS than a right angle

<p>an angle that opens up LESS than a right angle</p>
14
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obtuse angle

an angle that opens up MORE than a right angle

<p>an angle that opens up MORE than a right angle</p>
15
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straight angle

an angle that is straight - measures 180

<p>an angle that is straight - measures 180</p>
16
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protractor

a tool used to measure angles

<p>a tool used to measure angles</p>
17
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reflex angle

an angle that is greater than 180 degrees because the angle is bent beyond the straight line

<p>an angle that is greater than 180 degrees because the angle is bent beyond the straight line</p>
18
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quadrilateral

a polygon with four sides

<p>a polygon with four sides</p>
19
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trapezoid

A quadrilateral with exactly one pair of parallel sides

<p>A quadrilateral with exactly one pair of parallel sides</p>
20
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hexagon

6 sided polygon

<p>6 sided polygon</p>
21
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parallegram

a quadrilateral with both pairs of opposite sides parallel

22
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polygon

A closed plane figure made up of line segments

23
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triangle

A polygon with three sides.

24
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isosceles triangle

A triangle that has 2 equal sides.

<p>A triangle that has 2 equal sides.</p>
25
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scalene triangle

A triangle with no equal sides

<p>A triangle with no equal sides</p>
26
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equalateral triangle

a triangle with all equal sides

<p>a triangle with all equal sides</p>
27
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square

A quadrilateral with 4 sides that are equal and has all 90 degree angles

<p>A quadrilateral with 4 sides that are equal and has all 90 degree angles</p>
28
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rectangle

A parallelogram with four right angles

<p>A parallelogram with four right angles</p>
29
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rhombus

a parallelogram with 4 congruent sides

<p>a parallelogram with 4 congruent sides</p>