Download 1 - Quia

Geometry Vocabulary Page 1
1.) Point—a location on a plane
2.) Line—a straight path that goes on and on in 2 directions
3.) Plane—a flat surface that goes on and on in all directions
4.) Segment—part of a line with 2 endpoints
5.) Ray—part of a line with one endpoint with the other end going on forever
6.) Parallel Lines—lines on a plane that do not intersect
7.) Perpendicular Lines—lines that meet or cross to form right (90º) angles
8.) Intersecting Lines—lines that cross or meet but do NOT form right angles
9.) Collinear—points arranged in such a manner that a single line can be drawn through them •
10.) Non-collinear—3 or more points that a single line can NOT be drawn through
11.) Skew Lines—lines that lie in different planes
12.) Angle—a figure formed by 2 rays with the same endpoint
13.) Degree—the unit used to measure angles
º
14.) Vertex—the point where rays or 2 sides of a figure meet
15.) Acute Angle—an angle that measures less than 90º
16.) Obtuse Angle—an angle that measures more than 90º
17.) Right Angle—an angle that measures exactly 90º
18.) Straight Angle—an angle that measures exactly 180º
19.) Complementary Angles—2 angles that add up to 90º
20.) Supplementary Angles—2 angles that add up to 180º
21.) Transversal—a line that intersects a pair of parallel lines
22.) Exterior Angles—the outside angles created by a transversal line
23.) Interior Angles—the inside angles created by a transversal line
24.) Congruent Angles—angles that have the same measurement
•
•
Geometry Vocabulary Page 2
25.) Polygons—a closed shape with 3 or more straight sides
26.) Triangle—a 3-sided polygon
27.) Quadrilateral—a 4-sided polygon
28.) Pentagon—a 5-sided polygon
29.) Hexagon—a 6-sided polygon
30.) Octagon—an 8-sided polygon
31.) Decagon—a 10-sided polygon
32.) Diagonal—a line that goes from one vertex to another but is not an edge
33.) Perimeter—the distance around a polygon found by adding the lengths of all the sides
*34.) The measure of all of the angles of ANY triangle will ALWAYS add up to 180º.
35.) Acute Triangle—a triangle with 3 acute angles
36.) Obtuse Triangle—a triangle with 1 obtuse angle
37.) Right Triangle—a triangle that contains a 90º angle
38.) Equilateral Triangle—a triangle with 3 equal sides and angles
39.) Isosceles Triangle—a triangle with 2 equal sides and angles
40.) Scalene Triangle—a triangle with no equal sides or angles
*41.) The angles of ANY quadrilateral will ALWAYS add up to 360º.
42.) Parallelogram—a quadrilateral with both pairs of opposite sides parallel and equal
43.) Rectangle—a parallelogram with 4 right angles
44.) Rhombus—a parallelogram with 4 congruent (equal) sides
45.) Square—a rectangle with 4 congruent (equal) sides
46.) Trapezoid—a quadrilateral with only 1 pair of parallel sides
47.) Kite—a quadrilateral with 2 pair of adjacent sides that are equal (congruent)
48.) Congruent Figures—figures that have the same size and shape
Geometry Vocabulary Page 3
49.) Similar Figures—figures that have the same exact shape but different size (angles in similar
figures are ALWAYS congruent)
50.) Corresponding Parts—the matching parts in congruent or similar figures. (parts are always
proportional in similar figures)
51.) Line of Symmetry—a line that divides a figure into 2 congruent halves
52.) Circle—a set of points that are equal distance from a point called the center
53.) Center of a Circle—a point in a circle that is equal distance from all the points on its edge
54.) Circumference—the distance around the edge of a circle
55.) Arc—a section of the circumference of a circle
56.) Radius—a line that goes from one edge of a circle to the center
57.) Diameter—a line that goes from one edge of a circle to another passing through the center
58.) Chord—a line that goes from one edge of a circle to another WITHOUT passing through
the center
59.) Translation—moving a figure so that every point moves the same direction the same
distance (SLIDE)
60.) Reflection—flipping a figure across a line (mirror image)
61.) Rotation—turning or rotating a figure around a given point (TURN)
62.) Cube—a 3-dimensional shape with 6 congruent square faces
63.) Cone—a 3-dimensional shape with a circular base and 1 vertex
64.) Cylinder—a 3-dimensional shape with 2 circular bases that are congruent and parallel
65.) Sphere—a 3-dimensional shape with all points a given distance from a point called the
center
66.) Pyramid—a 3-dimensional shape with a polygon for a base and 3 or more triangular faces
67.) Prism—a 3-dimensional shape with 2 congruent parallel faces that are polygons (named by
the shape of its base)
68.) Face—the flat surface of a 3-dimensional shape
69.) Edge—the line segment where 2 faces of a 3-dimensional figure meet