# H Geometry Ch.1

### 56 terms by 13tglave

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vocab

### line segment

can be measured because it has 2 endpoints

### congruent

when segments have the same measure

### segment bisector

any segment, line, or plane that intersects a segment at its midpoint

### perpendicular

lines, segments, or rays that form right angles

### undefined terms

terms only explained using examples and descriptions
ex: point, line, plane

a location

### line

made up of points and has no thickness or width

### collinear

points on the same line

### plane

flat surface made up of points

### coplanar

points that lie on the same plane

### space

a boundless, 3D set of all points
contains lines and planes

### precision

depends on the smallest unit available on the measuring tool

### between

for any 2 points A and B on a line, there is another point C between A and B

### constructions

methods of creating geometric figures without the benefit of measuring tools

### absolute error

the absolute value of the difference between the actual measure of an object and the allowable measure

### relative error

the ratio of the absolute error to the actual measure

### significant digits

represent the accuracy of a measurement

### midpoint

the point on the segment that divides the segment into 2 congruent segments

### degree

a unit of measure used in measuring angles and arcs

part of a line

### opposite rays

if you choose a point on a line, that point determines exactly 2 rays

### angle

formed by 2 noncollinear rays that have a common endpoint

### sides

the rays of the angle

### vertex

the common endpoint

inside an angle

outside an angle

90 degrees

### acute angle

less than 90 degrees

### obtuse angle

larger than 90 degrees

### angle bisector

a ray that divides an angle into 2 congruent angles

2 angles that lie in the same plane, have a common vertex and a common side, but no common interior points

### vertical angles

2 nonadjacent angles formed by 2 intersecting lines

### linear pair

a pair of adjacent angles with noncommon sides that are opposite rays

### complementary angles

2 angles with measures that have a sum of 90

### supplementary angles

2 angles with measures that have a sum of 180

### n-gon

a polygon with n sides

### regular polygon

a convex polygon in which all the sides are congruent and all the angles are congruent

### perimeter

the sum of the length of the sides of the polygon

### circumference

the distance around the circle

### area

the # of the square units needed to cover a surface

### polyhedron

a solid with all flar surfaces that enclose a single region of space

### face

each flat surface (polygon)

### edges

the line segments where the faces intersect

### prism

a polyhedron with 2 parallel congruent faces

### bases

2 parallel congruent faces

### regular prism

a prism with bases that are regular polygons

### pyramid

a polyhedron with all faces except for one intersecting at one vertex

### regular polyhedron

a polyhedron if all its faces are regular congruent polygon and all of the edges are congruent

### platonic solids

5 types of regular polyhedra

### cylinder

a solid with congruent circular bases in a pair of parallel

### cone

a circular base and a vertex

### sphere

a set of points in space that are a given distance from a given point

### surface area

the sum of the areas of each face of a solid

### volume

the measure of the amount of space the solid encloses

### orthographic drawing

the 2D views of the top, left, front, and right sides of an object

### net

a pattern for a 3D solid

Example: