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STRAND C / STANDARD 1
GEOMETRY VOCABULARY TERMS
1.)POINT: a single location, one dimensional unit that is represented by a dot.
2.)LINE: all points on an infinite straight path that extends in both directions.
3.)PLANE: a flat surface and is infinite.
4.)SKEW: lines that do not lie in the same plane.
5.)COLLINEAR: two or more points that lie on the same line.
6.)COPLANAR: geometric objects that lie on the same plane.
7.)LINE SEGMENT: a section of a line with two endpoints.
8.)ENDPOINTS: points that are located and the end of each side of a line.
9.)RAY: a line that has one endpoint and extends infinitely in one direction.
10.)PARALLEL: two lines that are the same distance apart and never intersect.
11.)INTERSECT: lines that cross or overlap each other.
12.)PERPENDICULAR: two line segments that intersect each other at a 90-degree angle, or a right angle.
13.)ANGLE: two ray, two line segments, or a ray and a line segment both containing the same endpoint.
14.) RIGHT ANGLE: an angle whose measurement equals 90 degrees.
15.)ACUTE ANGLE: an angle whose measurement equals less than 90 degrees.
16.)OBTUSE ANGLE: an angle whose measurement greater than 90 degrees.
17.)STRAIGHT ANGLE: an angle that measures exactly 180 degrees.
18.)COMPLEMENTARY ANGLES: two angles whose sum equals exactly ninety degrees.
19.)SUPPLEMENTARY ANGLES: two angles whose sum equals 180 degrees.
20.)VERTICES: corners or points on a three-dimensional object.
21.)EDGES: where two surfaces intersect or sides.
22.)FACES: the flat surfaces of a three-dimensional figure.
23.)EQUILATERAL: all angles & sides are equal.
24.)EQUIANGULAR: all angles are equal.
25.)REGULAR POLYGONS: polygons where all sides & angles are equivalent or congruent.
26.)ISOSCELES TRIANGLE: two sides & two base angles of a triangle are equal.
27.)RIGHT TRIANGLE: a triangle where one angle is equal to 90 degrees.
28.)ACUTE TRIANGLE: all angles of a triangle are acute, less than 90 degrees.
29.)SCALENE TRIANGLE: all sides of an angle are different measures.
30.)OBTUSE TRIANGLE: one angle of a triangle is obtuse, greater than 90 degrees.
31.)INTERIOR ANGLES: the inside angles of a polygon.
32.)EXTERIOR ANGLES: the measures of the exterior angles of an angle.
33.)SUM OF INTERIOR ANGLES: Using the formula 180 (n-2) to determine the sum of all the angles inside the polygon. To determine the degrees of one angle just divide that amount by the number of sides.
34.)MEASURE OF THE EXTERIOR ANGLES: use the formula 360/n, n represents the number of sides of the polygon.
35.)BASE: the side the polygon rests on.
36.)HEIGHT: the vertical distance between the top and bottom of a polygon.
37.)ALTITUDE: also known as the height of a triangle from the vertex to the base.
38.)MEDIAN: the middle.
39.)HYPOTENUSE: the longest side of a triangle.
40.)QUADRILATERALS: four sided figure.
41.)PARALLELOGRAM: a quadrilateral whose opposite sides are parallel.
42.)RECTANGLE: a parallelogram whose angles are equal to 90 degrees.
43.)RHOMBUS: a parallelogram whose all sides are equal.
44.)SQUARE: a rhombus, rectangle, and parallelogram – all sides & angles are equal.
45.)TRAPEZOID: a quadrilateral with only one pair of parallel sides.
46.)CHORD: a line segment that goes through any two points on a circle.
47.)DIAMETER: a chord that runs directly through the center of a circle.
48.)RADIUS: a line segment that originates from the center point of a circle and ends on any other point on the
circle.
49.) CIRCLE: points around a line that connect which are equal distance from the center, no edges, faces,
or vertices.
50.)SIMILAR: having the same shape but not the same size.
51.)CONGRUENT: same shape and same size, equal to.
52.)PRISM: a three dimensional object which has two bases that are identical & parallel. Also all faces are
rectangular.
53.)PYRAMID: a three dimensional shape that only has one base and all the faces are triangular.
54.)CYLINDER: a three dimensional shape that has two congruent circular bases & it is curved.
55.)SYMMETRY: when the image can be split down the middle & folded over each other exactly
overlapping – a mirror image or reflection.
56.)TRANSFORMATION: the way an object can change position.
57.)TRANSLATION: to slide an object – a type of transformation.
58.)REFLECTION: a mirror image.
59.)ROTATION: to turn an image or object in a clockwise or counterclockwise direction in a specific degree.
60.)DIALATION: to enlarge or reduce an object or image a scale factor.
61.)TESSELLATION: created when a shape or pattern is repeated over and over again covering a plane
without any gaps or overlapping.
*to view pictures, examples, and interactive activities for the vocabulary terms please click on the following link
http://www.teachers.ash.org.au/jeather/maths/dictionary.html
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