Definitions Flashcards

1
Q

Geometry

A

branch of mathematics that deals with points, lines, planes

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2
Q

Point

A

Has no size, length, width or height. Represented by a dot

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3
Q

Line

A

set of points which has infinite length but no width or height. A line is named by a lower case letter

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4
Q

Plane

A

set of points that has infinite length and width but no height. We name a plane with a capital letter

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5
Q

Collinear points

A

points that lie on the same line.

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6
Q

Noncollinear points –

A

points that do not lie on the same line.

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7
Q

Coplanar points

A

points that lie on the same plane.

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8
Q

Noncoplanar points

A

points that do not lie on the same plane.

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9
Q

Segment

A

part of a line that consists of two points called endpoints

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10
Q

Ray

A

is the part of a line that contains an endpoint and all points extending in the other direction.

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11
Q

Congruent segments

A

segments that have the same length.

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12
Q

Bisector of a segment

A

line, ray segment, or plane that divides a segment into two congruent segments.

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13
Q

Midpoint of a segment

A

a point that divides the segment into two congruent segments.

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14
Q

Acute angle

A

Angle below 90 degrees

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15
Q

Right angle

A

Angle who measures at 90 degrees

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16
Q

Obtuse angle

A

angle whose measure is greater than 90 degrees but less than 180 degrees.

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17
Q

Straight angle

A

Angle that measures at 180

18
Q

Congruent angles –

A

Angles that are congruent on each side

19
Q

Angle bisector

A

A ray tht divides an angle into 2 congruency adjacent angles

20
Q

Triangle

A

the figure formed by three segments joining three noncollinear points.

21
Q

Acute triangle

A

triangle that has all acute angles.

22
Q

Right triangle

A

Triangle with right angle

23
Q

Obtuse triangle

A

Triangle with an obtuse angle

24
Q

Equiangular triangle

A

triangle with all angles congruent.

25
Scalene triangle
triangle with no sides congruent.
26
Isosceles triangle
triangle with at least two sides congruent.
27
Equilateral triangle
triangle with all sides congruent.
28
Adjacent angles
two coplanar angles with a common vertex and a common side between them
29
Vertical angles
the non-adjacent angles formed by two intersecting lines.
30
Complementary angles
two angles whose sum is 90 degrees.
31
Complementary angles
two angles whose sum is 90 degrees.
32
Supplementary angles
two angles whose sum is 180 degrees.
33
Perpendicular lines –
two lines that intersect to form right angles.
34
Parallel lines –
two lines are parallel if they are coplanar and do not intersect.
35
Skew lines –
are noncoplanar lines they will not intersect.
36
Polygon
– union of 3 or more coplanar segments that meet only at endpoints
37
Regular polygon –
polygon which is equilateral and equiangular.
38
Congruent triangles –
two triangles are congruent if corresponding sides are congruent and corresponding angles are congruent.
39
Median of a triangle
segment from the vertex of a triangle to the midpoint of the opposite side.
40
Altitude of a triangle
segment from the vertex of a triangle perpendicular to the line containing the opposite side.
41
Parallelogram –
quadrilateral with both pairs of opposite sides parallel