In the diagram below, BD is parallel to XY. What is the value of x?
Note: BD and XY have the little line over them but I have no idea how to put it.
(Picture below.)

- anonymous

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- anonymous

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- anonymous

I'd say 55. Am I right? Or it's 125?

- anonymous

HINT: x and 125 are supplementary...

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## More answers

- AriPotta

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- anonymous

ur correct....

- anonymous

How do I know if they're supplementary?

- AriPotta

because it's a straight line

- AriPotta

they're a linear pair

- Geometry_Hater

It would add up to equal 180

- anonymous

How do I know if I should put 55 or 125 because last time I did a problem like that and the answer was the same as 125.

- AriPotta

it's 55

- AriPotta

i did the math on that pic i posted

- anonymous

Does it have to do with the lines?
For example this question:

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- Geometry_Hater

Its the lower angle
(It looks smaller so it has to be 55)

- anonymous

^ The answer for that one was 67.

- AriPotta

right, because those angles were alternate exterior angles

- anonymous

Supplementary lines: subtract from 180.
Alternate exterior angles: the same as the other line.
Am I right?
If yes, how do I know the difference from both of the different lines?

- AriPotta

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- AriPotta

that shows congruency

- AriPotta

and any angles who are on a straight line add up to 180

- AriPotta

because, it's a straight line and straight lines are 180 degrees

- AriPotta

does that make sense?

- anonymous

I think so... Okay, let me see if I've got it. Okay, so for that one... That's a Alternate exterior angle?

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- AriPotta

those are corresponding angles

- Geometry_Hater

X is corresponding

- AriPotta

they are congruent too though

- anonymous

See... That's what I don't understand. How do you guys know they are congruent.
Sorry. i'm stupid. :/

- AriPotta

look at the pic i posted

- AriPotta

it shows all angles that are congruent

- Geometry_Hater

All lines are 180.
So whenever we have an angles like that they will always equal 180 degrees together

- anonymous

Wait... I'm thinking haha.

- anonymous

Okay, so if they're congruent that means they have the same number right? 110 would be the answer for that one?

- AriPotta

yea

- Geometry_Hater

Thats right

- anonymous

Okay so for this one it isn't congruent am i right? so the answer would be 75?

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- AriPotta

those are congruent

- AriPotta

they are also corresponding angles

- Geometry_Hater

They are corresponding because they are in similar places

- anonymous

AHHHHHHHHHHHHHHHHHHH. I DON'T GET THIS.

- AriPotta

:/ i'm not sure how to explain it

- Geometry_Hater

Hmm hold on

- Geometry_Hater

|dw:1349397323829:dw|
1 and 5 would be corresponding angles because they are in the same places

- AriPotta

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- AriPotta

if you can read what i wrote lol.

- anonymous

I can! Wait... So that would mean every line is corresponding? Why do I sometimes have to put the same number that's on top and then other times i have to subtract from 180..

- Geometry_Hater

Every line isnt corresponding.........
For instance in my drawing 1 and 5 are corresponding but not 1 & 6

- AriPotta

no, no. i mean those ANGLES are corresponding

- AriPotta

the lines are parallel and cut by a tranversal which makes the angles i listed corresponding and congruent

- anonymous

Thank you so much guys!

- AriPotta

no problem :) do you understand it better?

- anonymous

yep! I hope so!

- AriPotta

good luck with your other questions!

- anonymous

Thank you so much! Seriously!

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