Geometry Unit 1

Question 1

point def. and example

Answer 1

A finite space
represented by a
dot. Ex: A or pt. A
CAPITAL

Question 2

line def. and example

Answer 2

Through any
2 points,
there is one
line. Extends
without end.
EX: 2 UPPER CASE letters. or Line CURSAVE LETTER

Question 3

segment def. and example

Answer 3

Has two
endpoints.
Doesn’t go
on forever.
EX: 2 UPPER CASE letters

Question 4

ray def. and example

Answer 4

Initial point,
then
continues
infinitely in
one direction. EX: 2 UPPER CASE letters, 1st letter is initial point.

Question 5

opp. rays def.

Answer 5

Two rays
with the
same initial
point, but go
in opposite
directions.
Forms a
straight line.

Question 6

collinear points def. and example

Answer 6

points that lie on the same line. EX: pts. A, B, and C.

Question 7

plane def. and example

Answer 7

Extends in
all
directions,
forming a
surface. 2 dimensions.
EX: 3 noncollinear points. Plane XYZ. Plane A.

Question 8

coplanar points def. and example

Answer 8

Points that
lie on the
same plane. EX: pts. X, Y, and Z

Question 8

intersection def.

Answer 8

Set of
points 2 or
more
figures have
in common.

Question 9

if asked to graph an inequality on a number line and it includes “or” what does that mean?

Answer 9

it means that solution includes all numbers to satisfy either inequality.

Question 10

distance

Answer 10

Positive length between two points (always pos.)

Question 11

congruent segments

Answer 11

segments with the same length.
AB with segment over it and ≅ symbol means the item itself but AB=CB means the #’s (length)

Question 12

postulate

Answer 12

rules of geometry that are not proved

Question 13

ruler postulate def and formula

Answer 13

The distance between 2 points is
the absolute value of the
difference between them.
Distance=|c1-c2|

Question 14

segment addition postulate

Answer 14

Adding two pieces of a
segment = the whole
EX: AB+BC=AC

Question 15

midpoint def and notation

Answer 15

point in middle of segment.
M is the midpoint of AB (with line over AB).

Question 16

segment bisector def. and not.

Answer 16

point, line, or seg. that cuts a segment in half. CD bisects AB. (line and segment signs over letters)

Question 17

perpendicular def and notation

Answer 17

something that intersects at a right angle. AB ⊥CD (with lines over letters)

Question 18

perpendicular bisecor def

Answer 18

perpen. line or segment that bisects a segment

Question 19

distance def and ex.

Answer 19

legnth between 2 points measured in units. AB.

Question 20

parallel lines notation

Answer 20

a||m

Question 21

angle def

Answer 21

2 different rays w/same initial point

Question 22

vertex def

Answer 22

common initial point where rays meet

Question 23

sides def and not.

Answer 23

the rays of the angle. vertex must come first

Question 24

acute def

Answer 24

more than 0* but less than 90*

Question 25

obtuse def

Answer 25

more than 90* but less than 180*

Question 26

straight def.

Answer 26

measures 180*

Question 27

angle bisector def.

Answer 27

ray that cuts an angle in half to make 2 congruent angles

Question 28

adjacent angles def

Answer 28

2 angles that share a common side and vertex

Question 29

angle addition postulate def and not.

Answer 29

if u add 2 adjacent angles, it totals to get theirr sum. m∠ABC + m∠CBD= m ∠ABD

Question 30

complementary angles def

Answer 30

2 angles that add up to 90*

Question 31

supplementary angles def

Answer 31

2 angles that add up to 180*

Question 32

linear pair def.

Answer 32

2 adjacent angles whose non common sides are opp. rays. **they will always add to 180.

Question 33

vertical angles def.

Answer 33

2 angles whose sides form 2 pairs of opp. rays **they will always be congruent

Question 34

midpoint formula

Answer 34

(x1 + x2)/2, (y1 + y2)/2

Question 35

distance formula

Answer 35

d=√(x-x)²+(y-y)²