Question

can someone please help me on a geometry question?

Answer 1

i can try

Answer 2

A student wrote the following sentences to prove that the two pairs of parallel opposite sides of parallelogram ABCD are congruent:

For triangles ABD and CDB, alternate interior angles ABD and CDB are congruent because AB and DC are parallel lines. Alternate interior angles ADB and CBD are congruent because AD and BC are parallel lines. DB is congruent to DB by _______________. The triangles ABD and CDB are congruent by ASA postulate. As corresponding parts of congruent triangles are congruent, AB is congruent to DC and AD is congruent to BC by CPCTC.

Which phrase best completes the student's proof?

Answer 3

http://learn.flvs.net/webdav/assessment_images/educator_geometry_v16/image0044e8c7278.jpg

Answer 4

associative property
reflexive property
substitution property
transitive property

Answer 5

@freckles can you help me?

Answer 6

Wrong section.

Answer 7

that link doesn't work
@iiAriana is not showing math for you? it is showing math for me.

Answer 8

also reflexive property is x=x
transitive property says if x=a and b=x, then a=b
associative property is (a+b)+c=a+(b+c)
substitution property is something like if a=b and b<c, then a<c (See how b was replaced with a; we substituted a for b since a=b)

Answer 9

DB is congruent to DB by _______________.
so what property seems most likley here ?

Answer 10

likely *

Answer 11

Associative property ?

Answer 12

think of the equals above like congruency
reflexive property is x congruent to x
etc...

Answer 13

I'm confused because I' not very good with this stuff

Answer 14

doesn't that like say DB is congruent to DB

Answer 15

compared this to what I wrote

Answer 16

what is the only thing in that form

Answer 17

reflexive property is x is congruent to x
transitive property says if x is congruent to a and b is congruent to x, then a is congruent to b
...
associative property is (a+b)+c=a+(b+c)
substitution property is something like if a=b and b<c, then a<c (See how b was replaced with a; we substituted a for b since a=b)

Answer 18

isn't DB congruent to DB in the form x congruent to x?

Answer 19

yes

Answer 20

and what name does that property have?

Answer 21

you can find above that I called it the...

Answer 22

Reflexive property?

Answer 23

yes!

Answer 24

have to go now
have fun :)

Answer 25

ok thanx so much :)