Geometry Vocabulary Flashcards

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created 4 years ago by mcarver
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Geometry Vocabulary
updated 4 years ago by mcarver
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1

an exact spot in space

Point

2

straight path that continues infinitely in two directions

Line

3

part of a line with two endpoints

Line segment

4

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

Ray

5

an endless flat surface

Plane

6

lines that never intersect

parallel

7

lines that cross at a 90 degree angle

perpendicular

8

lines that pass through the same point

intersecting lines

9

90 degrees

a right angle

10

less than 90 degrees

acute angle

11

greater than 90 degrees but less than 180 degrees

obtuse angle

12

180 degrees

a straight angle

13

same exact measurement(s)

congruent

14

Two angles whose sum is 180°

supplementary angles

15

Two angles whose sum is 90°.

Complementary angles

16

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

18

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

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

transversal

20

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

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

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.

vertex

24

a ruler with no markings on it

straight edge

25

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

compass

26

size of a 2D surface

area

27

distance around a 2D shape

perimeter

28

line segment with end points on a circle

chord

29

distance around a circle

circumference

30

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

similar

31

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

diameter

32

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

33

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

surface area

34

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

transformation

35

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

translation

36

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

rotation

37

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

reflection

38

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

bisector

39

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

midpoint

40

a part of the circumference of a circle or other curve

arc

41

The amount of space an object takes up.

volume

42

a quadrilateral with four right angles and 4 congruent sides

square

43

a quadrilateral with four right angles

rectangle

44

a quadrilateral with four congruent sides

rhombus

45

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

kite

46

A triangle with all acute angles

acute triange

47

A triangle with one obtuse angle and two acute angles

obtuse triangle

48

A triangle with one 90 degree angle

right triangle

49

A triangle with all congruent sides

equilateral triangle

50

A triangle with at least two congruent sides

isosceles

51

A triangle with no congruent sides

scalene triangle

52

quadrilateral with both pairs of opposite sides are parallel

parallelogram

53

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

polygon

54

four sided polygon

four sided polygon

55

A polygon with congruent sides and angles

regular polygon

56

a quadrilateral with exactly one pair of parallel sides

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.

right prism

60

3D object with a circular base and one vertex

cone

61

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

pyramid

62

A prism with two congruent parallel bases that are circles.

cylinder

63

A rectangular prism with faces that are all squares

cube

64

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

Secant

65

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

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.

Central Angle

67

*Secondary 2 and higher only*

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

*Secondary 2 and higher only*

Sine

68

*Secondary 2 and higher only*

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

*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.

*Secondary 2 and higher only*

Tangent (as a triangle ratio)

70

*Secondary 2 and higher only*

Exterior Angles Theorem

*Secondary 2 and higher only*

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