###
Point

a geometric element that has position but no extension

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line

a straight path that extends without end in opposite directions

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collinear

points that lie on the same line

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non collinear

points that do not lie on the same line

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ray

extend or spread outward from a center or focus or inward towards a center

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end point

The point at the segment or ray

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plane

an unbounded two-dimensional shape

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parallel lines

coplanar lines that do not intersect

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intersecting lines

lines that cross at one point

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perpendicular lines

Lines that intersect to form right angles

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skew lines

lines that lie in different planes. they are neither parallel or intersecting

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midpoint

a point that divides a segment into two congruent segments

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congruent segments

Segments that have the same length

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angle

two rays with a common endpoint

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vertex

The common endpoint of an angle

###
protractor

drafting instrument used to draw or measure angles

###
degrees

used to measure temperature, latitude, longitude, right ascsension, and declination

###
congruent angles

Angles that have the same measure

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right angles

angles that measure 90 degrees

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obtuse angles

angles more than 90 degrees

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acute angles

angles that are less than 90 degrees

###
complementary angles

Two angles whose sum is 90 degrees

###
supplementary angles

Two angles whose sum is 180 degrees

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