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AM After School Help > Math Chapter 18 > Flashcards

Math Chapter 18 Flashcards

To learn the vocabulary of Chapter 18

1
Q

A figure that can be rotated less than 360 degress around a central point and it looks the same

A

rotational symmetry

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2
Q

A figure that can be folded in half and it is the same on both sides

A

line symmetry

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3
Q

An angle less than 90 degrees

A

acute angle

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4
Q

Figures with the same shape and size.

A

congruent figures

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5
Q

A triangle with one obtuse angle

A

obtuse triangle

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6
Q

A closed plane figure where all points are the same distance form the center point.

A

circle

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7
Q

A tool used for measuring or drawing angles

A

protractor

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8
Q

A line segment that passes through the center of the circle and has both of its end points on the circle.

A

diameter

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9
Q

A _____ is a quadrilateral with two pairs of opposite sides that are parallel and congruent

A

parallelogram

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10
Q

A triangle that doesn’t have any congruent sides

A

scalene triangle

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11
Q

A _____ and a _____ have four right angles with opposite sides that are parallel and congruent

A

rectangle, square

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12
Q

A two demensional pattern that can be folded into a three-dimensional polyhedron

A

net

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13
Q

A repeating pattern of closed figures. There aren’t any gaps between the polygons.

A

tessellation

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14
Q

Lines that are not in the same plane, not parallel, and do not intersect

A

skew lines

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15
Q

A triangle where all of the sides are congruent

A

equalateral triangle

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16
Q

Two lines side by side that never touch

A

parallel lines

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17
Q

Part of a line between two endpoints.

A

line segment

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18
Q

A solid figure with faces that are polygons

A

polyhedron

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19
Q

A flat surface that extends forever in all directions. It is names with three points not on the same line.

A

plane

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20
Q

An angle that measures exactly 180 degrees

A

straight angle

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21
Q

_____ sides and _____ angles are in the same relative position in different figures.

A

corresponding, corresponding

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22
Q

A type of transformation where the figure slides to a new postion.

A

translation

23
Q

A _____ is a quadrilateral with one pair of parallel sides

A

trapazoid

24
Q

A closed figure with four sides and four angles

A

general quadrilateral

25
Q

All the polygons that are flat surfaces of a solid figure

A

faces

26
Q

What are the two categories of quadrilaterals?

A

parallelograms and trapezoids

27
Q

A part of a line that begins at one end point and goes on forever in the other direction. It is named with tow points.

A

ray

28
Q

The top or bottom of a prism

A

base

29
Q

A polygon where all faces and angles are congruent

A

regular polygon

30
Q

Figures that have the same shape but different sizes.

A

similar figures

31
Q

A line segment with its end points on the circle. It does not pass through the center point of a circle.

A

chord

32
Q

A _____ has four congruent sides and four right angles

A

square

33
Q

A triangle with three acute angles

A

acute triangle

34
Q

A type of transformation that is a turn. The figure turns to a new postion about a vertex, or point of rotation.

A

rotation

35
Q

‘what does “intersect” mean?

A

to “cross”

36
Q

This type of triangle has two congruent sides

A

isosoles triangle

37
Q

A straight path in a plane that goes on forever in each direction. It is named with two points.

A

line

38
Q

An angle that measures 90 degrees

A

right angle

39
Q

A type of transformation where the figure is flipped over a line.

A

reflection

40
Q

An angle that is measures more than 90 degrees but less than 180 degrees

A

obtuse angle

41
Q

This triangle has a right angle

A

right triangle

42
Q

The line where two faces meet

A

edge

43
Q

A square can be both a __________ and a ___________.

A

rectangle, rhombus

44
Q

A _____ is a polyhedron with only one polygon base. All the other faces are triangles that meet at a common vertex. The shape of its base names the figure.

A

pyramid

45
Q

A _____ is a polyhedron that has two congruent and parallel polygons as bases.

A

prism

46
Q

A _____ is a parallelogram with 4 congruent sides and no right angles.

A

rhombus

47
Q

What are the two categories of parallelograms?

A

rectangles and rhombuses

48
Q

An exact location in space, named with a letter.

A

point

49
Q

2-D closed figures made of line segments. They are named by the numbers of their sides.

A

polygons

50
Q

Two lines that intersect to form right angles

A

perpendicular lines

51
Q

A movement of a figure to a new postion by a translation, reflection, or rotation

A

transformation

52
Q

Two lines that cross at one point

A

intersecting lines

53
Q

The point where three or more edges meet

A

vertex

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