Geometry Vocabulary Flashcards


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created 3 years ago by mcarver
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Geometry Vocabulary
updated 3 years ago by mcarver
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1

an exact spot in space

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Point

2

straight path that continues infinitely in two directions

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Line

3

part of a line with two endpoints

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Line segment

4

part of a line with one endpoint and one arrow that goes on forever

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Ray

5

an endless flat surface

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Plane

6

lines that never intersect

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parallel

7

lines that cross at a 90 degree angle

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perpendicular

8
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lines that pass through the same point

intersecting lines

9

90 degrees

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a right angle

10

less than 90 degrees

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acute angle

11

greater than 90 degrees but less than 180 degrees

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obtuse angle

12

180 degrees

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a straight angle

13

same exact measurement(s)

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congruent

14

Two angles whose sum is 180°

supplementary angles

15

Two angles whose sum is 90°.

Complementary angles

16
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the pairs of opposite angles made by two intersecting lines (they will be congruent)

vertical angles

17

angles that are right next to each other

adjacent angles

18
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two angles in the same relative position at each intersection in a transversal (where a straight lines cross two parallel lines). These angles are congruent.

corresponding angles

19
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parallel lines are intersected by another line, the intersecting line is called a ______________________

transversal

20
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Each pair of these angles are inside the parallel lines, and on opposite sides of the transversal (these angles are congruent)

alternate interior angles

21
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a pair of angles on the outer side of each of those two parallel lines but on opposite sides of the transversal (these angles are congruent)

Alternate Exterior Angles

22
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the two inside angles on the same side in a traversal will equal _____

180 degrees (same-side interior angles)

23

where two or more line segments or rays meet.

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vertex

24

a ruler with no markings on it

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straight edge

25

tool used to draw circles and arcs (parts of circles)

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compass

26

size of a 2D surface

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area

27

distance around a 2D shape

perimeter

28

line segment with end points on a circle

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chord

29

distance around a circle

circumference

30

Figures with corresponding angles that are equal and corresponding sides that are proportional

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similar

31

A chord that passes through the center of the circle from one edge to another

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diameter

32

A line segment from the center of a circle to the edge

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radius

33

The total area on all sides (surfaces) of a figure

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surface area

34

The movement of objects in the coordinate plane where image is either similar to or congruent to the pre-image.

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transformation

35

A Slide, Each vertex moves the same distance in the same directions

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translation

36

A turn, Each vertex is rotated the number of degrees around a rotation point

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rotation

37

A Flip, Each vertex is flipped across a line of reflection to result in a mirror image.

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reflection

38

a line, segment or ray that goes through the midpoint of a segment

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bisector

39

A point on a line segment that divides it into two equal parts.

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midpoint

40

a part of the circumference of a circle or other curve

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arc

41

The amount of space an object takes up.

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volume

42

a quadrilateral with four right angles and 4 congruent sides

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square

43

a quadrilateral with four right angles

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rectangle

44

a quadrilateral with four congruent sides

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rhombus

45

A quadrilateral with two sets of congruent lines that are adjacent to each other.

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kite

46

A triangle with all acute angles

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acute triange

47

A triangle with one obtuse angle and two acute angles

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obtuse triangle

48

A triangle with one 90 degree angle

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right triangle

49

A triangle with all congruent sides

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equilateral triangle

50

A triangle with at least two congruent sides

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isosceles

51

A triangle with no congruent sides

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scalene triangle

52

quadrilateral with both pairs of opposite sides are parallel

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parallelogram

53

A closed figure formed by three or more line segments that do not cross.

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polygon

54

four sided polygon

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four sided polygon

55

A polygon with congruent sides and angles

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regular polygon

56

a quadrilateral with exactly one pair of parallel sides

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trapezoid

57

A set of points in the same plane equal distance from the center.

circle

58

A set of all points in space that are the same distance from the center point.

sphere

59

A 3D object where the rectangular faces are perpendicular to the base shape. The base can be any shape.

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right prism

60

3D object with a circular base and one vertex

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cone

61

A prism with triangular faces that meet at one point, a vertex and base that is a polygon.

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pyramid

62

A prism with two congruent parallel bases that are circles.

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cylinder

63

A rectangular prism with faces that are all squares

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cube

64

A line that intersects a curve (or circle) in at least two distinct points.

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Secant

65

A line that touches a curve (or circle) at exactly one point.

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Tangent (to a circle)

66

An angle whose vertex is the center O of a circle and whose legs (sides) are radii intersecting the circle in two distinct points A and B.

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Central Angle

67

*Secondary 2 and higher only*

The ratio between the side opposite of an angle and the hypotenuse.

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*Secondary 2 and higher only*

Sine

68

*Secondary 2 and higher only*

The ratio between the side adjacent to an angle and the hypotenuse.

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*Secondary 2 and higher only*

Cosine

69

*Secondary 2 and higher only*

The ratio between the side opposite of an angle and the side adjacent to the angle.

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*Secondary 2 and higher only*

Tangent (as a triangle ratio)

70

*Secondary 2 and higher only*

Exterior Angles Theorem

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*Secondary 2 and higher only*

The exterior angle of a triangle is equal to the sum of the two opposite interior angles