Test 1

Question 1

point

Answer 1

an undefined term with no size. Labeled with capital letter

Question 2

line

Answer 2

a line that extends in both directions without end

Question 3

line segment

Answer 3

part of a line, with two distinct end points

Question 4

collinear points

Answer 4

points that lie on the same line (must name three)

Question 5

non-collinear points

Answer 5

points that do not lie on the same line (must name three)

Question 6

plane

Answer 6

flat surface that extends in all directions without end and has no thickness

Question 7

co-planer points

Answer 7

points that lie in the same plane; any three non-collinear points are co-planer

Question 8

non-co-planer

Answer 8

points that do not lie in the same plane. (must name four)

Question 9

the intersection of two lines is a _________

Answer 9

point

Question 10

the intersection of two planes is a ____________

Answer 10

line

Question 11

the intersection of a line and a plane is a _________

Answer 11

point

Question 12

postulate

Answer 12

rule or statement that is accepted without proof (assumed to be true)

Question 13

Segment Addition Postulate

Answer 13

if B is between A and C; 
then AB + BC = AC
and
if AB and BC = AC 
then B is between A and C

Question 14

congruent segments

Answer 14

segments with an equal length

Question 15

ray

Answer 15

has one distinct endpoint and extends in the opposite direction without end

Question 16

opposite rays

Answer 16

share an endpoint and make up a line

Question 17

angle (

Answer 17

formed by two non-collinear rays with a common endpoint

Question 18

Acute angles

Answer 18

measures between 0 and 90 degrees

Question 19

Right angles

Answer 19

measures 90 degrees

Question 20

obtuse angles

Answer 20

measures between 90 and 180 degrees

Question 21

straight angles

Answer 21

measures 180 degrees

Question 22

congruent angles

Answer 22

angles with the same measurement (degrees)

Question 23

Angle Addition Postulate

Answer 23

the little angle plus the little angle equals the big angle

Question 24

adjacent angles

Answer 24

two angles that share a vertex and a side but no common interior points (don’t overlap)

Question 25

Midpoint of a segment

Answer 25

point that bisects (divides) a segment into two congruent segments

Question 26

segment bisector

Answer 26

a segment, ray, line or plane that intersects a segment at its midpoint.

Question 27

midpoint formula

Answer 27

if A = (x,y) and B = (x2,y2) then the midpoint is: (x + x2) /2 = Mx (y + y2) /2 = My

Question 28

Theorm

Answer 28

a statement that can be proven (formula = theorm)

Question 29

Vertical angles

Answer 29

sides form two pairs of opposite rays; they are congruent (looks like an "x")

Question 30

linear pair

Answer 30

two adjacent angles whose non-common sides are opposite rays (line = 180 degrees)

Question 31

complementary angles

Answer 31

two angles whose sum is 90 degrees

Question 32

supplementary angles

Answer 32

two angles whose sum is 180 degrees

Question 33

angle bisector

Answer 33

a ray that divides an angle into 2 adjacent congruent angles