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Angle vocabulary

Match vocabulary words to their definitions

AB
Vertexb.a point in a geometrical solid common to three or more sides.c.the intersection of two sides of a plane figure.
interior anglean angle formed by two sides of a simple polygon that share an endpoint, namely, the angle on the inner side of the polygon
exterior angleangle formed by one side of a simple polygon and a line extended from an adjacent side
adjacent anglestwo angles having the same vertex and having a common side between them
complementary anglesTwo angles whose sum is 90°.
supplementary angleTwo angles whose sum is 180°
perpendicularmeeting a given line or surface at right angles
horizontal lineA line with the slope of 0. When graphing it is parallel to the x axis
vertical lineA line with an undefined slope x/0. When graphing a vertical line it is parallel to the y axis
intersectLines that have 1 or more points in common; those that cross
bisectto cut or divide into two equal parts
alternate anglestwo nonadjacent angles made by the crossing of two lines by a third line, both angles being either interior or exterior, and being on opposite sides of the third line
straight angleformed when the legs are pointing in exactly opposite directions; this forms a line (180 degrees)
collinearPassing through or lying on the same straight line
coplanarbeing or operating in the same plane
congruentsimilar; equal
vertical anglesTwo angles formed by two intersecting lines and lying on opposite sides of the point of intersection (they share a common vertex)
acute angleAn angle measuring less than 90 degrees
right angleAn angle measuring 90 degrees
obtuse anglesAn angle measuring more than 90 degrees but less than 180 degrees
reflex anglesAn angle measuring more than 180 degrees but less than 360 degrees
coordinates(x,y); points on a graph


Jane Addams High School
IL

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