Question

Triangle DOG is transformed using a reflection.

Which could be coordinates of D'O'G' after the reflection?

A. D=(0,0), O=(-1,-2), G=(1,4)

B. D=(0,0), O=(-1,-2), G=(1,-4)

C. D=(0,0), O=(-2, 1), G=(-1, -4)

D. D=(0,0), O=(-1,2), G=(1,4)

Answer 1

please help me!

Answer 2

@mathman806

Answer 3

@mathcalculus

Answer 4

reflection on the x-axis or , y-axis ??

Answer 5

y- axis :)

Answer 6

please help!

Answer 7

find out where wud O go

Answer 8

rule for reflection in y-axis :-

(x, y) ---> (-x, y)

Answer 9

wat are the coordinates of point O before reflection ?

Answer 10

Before reflection, (1,2)

After: (-1,2)?

Answer 11

Awesome :)
Now look at ur options

Answer 12

is it the last one?

Answer 13

brilliant !!

Answer 14

Thank you so much! can you help me with another one?

Answer 15

yea sure :)

Answer 16

Whats this?^

Answer 17

this is how the triangle looks after reflection :)

Answer 18

What additional information would you need to prove that ΔABC ≅ ΔDEF by SAS?

A. segment AC ≅ segment EF

B. segment BC ≅ segment FE

C. segment AC ≅ segment FE

D. segment BC ≅ segment EF

Answer 19

this is the traingle after reflection

Answer 20

oh okay thanks :)

Answer 21

look at ur options,
see that none of them have angles.
all of them have SEGMENTS

Answer 22

yeah I see that

Answer 23

good :) now, look at the triangles.
wat info we're given ?

Answer 24

That AB and DE are congruent?

Answer 25

Yes !
and ?

Answer 26

also,

\(\angle B \cong \angle E\)

Answer 27

they both have one green arc on them, indicating they're congruent

Answer 28

yes I was going to type that! ahah

Answer 29

oops! sorry about that.. still good, you have another question :-

which postulate u can use to prove these triangles are congruent ?

Answer 30

use the fact that, ur options have all Sides

Answer 31

I dont know what postulate means:(

Answer 32

SAS
SSS
ASA

Answer 33

those are the congruence postulates

Answer 34

or theorems or w.e

Answer 35

since we're given Side and Angle are congruent
we just need another Side to use SAS

Answer 36

that side wud be :-
\(\large BC \cong EF\)

you tell me why

Answer 37

thats the answer btw..

Answer 38

oh okay thank you so much, that would be the side because that is the side that is not identified as anything?

Answer 39

thats partially correct, but ok.. i see u wil get hang of these as these after doing few more problems :) dont rush yet, you're doing great !

Answer 40

Line 1 - segment AB equals 2, segment FD equals 2, segment AB is congruent to segment FD

Line 2 - ∠A ≅ ∠F

Line 3 - Length of segment AC.
A (1, 2)
C (3, 3)

segment AC = 2.23

Line 4 - Length of segment EF.
E (3, 2)
F (5, 3)

Line 5- segment AC is congruent to segment FE

Line 6- triangle ABC is congruent to triangle EFDby SAS

Answer 41

picture for line 3

Answer 42

picture for line 4

Answer 43

Please help @ganeshie8 I really need to pass

Answer 44

is that the whole question ?
or is there a triangle/lines pic that goes wid this question ?

Answer 45

oh yeah here sorry

Answer 46

I think it is line 5 but Idk

Answer 47

Line 6 has a serious problem

Answer 48

Line 6- triangle ABC is congruent to triangle EFDby SAS
^ ^

Answer 49

first triangle started wid A
second triangle started wid E

Answer 50

*look at the pic,
A and E are not equal !

Answer 51

oh so line 6 is the answer?

Answer 52

yes

Answer 53

i need to go,
please close this... and ask a new question.... good luck !!