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# Fennville Geo Unit 1

### review of key ideas for unit 1 geometry

TermDefinition
point names a location. represented by a dot.
line straight path through two or more points that extends forever.
segment part of a line consisting of two endpoints and all points between them.
ray part of a line that starts at an endpoint and extends forever in one direction.
angle formed by two rays with the same endpoint.
acute angle angle that measures greater than zero and less than 90 degrees
right angle angle that measures exactly 90 degrees
obtuse angle angle that measures greater than 90 degrees and less than 180 degrees
straight angle angle formed by two opposite rays and measures exactly 180 degrees
angle bisector a ray that divides an angle into two congruent angles. a ray that splits an angle in half.
bisect to cut in half
collinear points points that lie on the same line
non-collinear points three or more points that do not lie on the same line
coplanar points that lie on the same plane
congruent angles angles which have the same measure
complementary angles two angles that add to 90 degrees
supplementary angles two angles that add to 180 degrees
distance absolute value of the difference of the coordinates of two points on a number line
linear pair of angles two adjacent angles that form a straight angle or line.
adjacent angles two angles with the same vertex that share a side but do not share any interior points.
non-adjacent angles two angles that are not adjacent.
plane flat surface that has no thickness and extends forever; formed by three non-collinear points
vertical angles two non-adjacent angles formed by two intersecting lines.
midpoint of a segment point exactly in the middle of a segment.
reflection transformation across a line (flip) which produces congruent figures with opposite orientations
rotation transformation about a point (turn) which produces congruent figures with the same orientation
translation transformation in which all points move the same distance in the same direction (slide) which produces congruent figures with the same orientation
transformation a change in the position, size, or shape of a figure.
opposite rays two rays that have a common endpoint and form a line.
AC by the segment addition postulate, when point B is between points A and C on segment AB, AB + BC =
ABD by the angle addition postulate, measure of angle ABC + measure of angle CBD = measure of angle