marcoduuuh
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.)
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marcoduuuh
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marcoduuuh
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I'd say 55. Am I right? Or it's 125?
dpaInc
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HINT: x and 125 are supplementary...
AriPotta
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dpaInc
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ur correct....
marcoduuuh
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How do I know if they're supplementary?
AriPotta
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because it's a straight line
AriPotta
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they're a linear pair
Geometry_Hater
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It would add up to equal 180
marcoduuuh
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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
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it's 55
AriPotta
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i did the math on that pic i posted
marcoduuuh
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Does it have to do with the lines?
For example this question:
Geometry_Hater
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Its the lower angle
(It looks smaller so it has to be 55)
marcoduuuh
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^ The answer for that one was 67.
AriPotta
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right, because those angles were alternate exterior angles
marcoduuuh
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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
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that shows congruency
AriPotta
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and any angles who are on a straight line add up to 180
AriPotta
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because, it's a straight line and straight lines are 180 degrees
AriPotta
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does that make sense?
marcoduuuh
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I think so... Okay, let me see if I've got it. Okay, so for that one... That's a Alternate exterior angle?
AriPotta
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those are corresponding angles
Geometry_Hater
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X is corresponding
AriPotta
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they are congruent too though
marcoduuuh
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See... That's what I don't understand. How do you guys know they are congruent.
Sorry. i'm stupid. :/
AriPotta
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look at the pic i posted
AriPotta
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it shows all angles that are congruent
Geometry_Hater
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All lines are 180.
So whenever we have an angles like that they will always equal 180 degrees together
marcoduuuh
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Wait... I'm thinking haha.
marcoduuuh
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Okay, so if they're congruent that means they have the same number right? 110 would be the answer for that one?
AriPotta
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yea
Geometry_Hater
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Thats right
marcoduuuh
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Okay so for this one it isn't congruent am i right? so the answer would be 75?
AriPotta
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those are congruent
AriPotta
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they are also corresponding angles
Geometry_Hater
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They are corresponding because they are in similar places
marcoduuuh
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AHHHHHHHHHHHHHHHHHHH. I DON'T GET THIS.
AriPotta
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:/ i'm not sure how to explain it
Geometry_Hater
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Hmm hold on
Geometry_Hater
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|dw:1349397323829:dw|
1 and 5 would be corresponding angles because they are in the same places
AriPotta
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AriPotta
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if you can read what i wrote lol.
marcoduuuh
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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
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Every line isnt corresponding.........
For instance in my drawing 1 and 5 are corresponding but not 1 & 6
AriPotta
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no, no. i mean those ANGLES are corresponding
AriPotta
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the lines are parallel and cut by a tranversal which makes the angles i listed corresponding and congruent
marcoduuuh
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Thank you so much guys!
AriPotta
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no problem :) do you understand it better?
marcoduuuh
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yep! I hope so!
AriPotta
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good luck with your other questions!
marcoduuuh
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Thank you so much! Seriously!