Geometry Angles

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I can't figure out how to do 9-12 and number 17. can someone please explain it to me or provide links or something? I just really don't get it and I'm trying to teach myself geometry so I have a headstart for next year. Please help!

[attachment=0:210wxlks]math.jpg[/attachment:210wxlks]

thank you guys so much !
 

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guest said:
I can't figure out how to do 9-12 and number 17. can someone please explain it to me or provide links or something? I just really don't get it and I'm trying to teach myself geometry so I have a headstart for next year. Please help!

[attachment=0:kvyhof0n]math.jpg[/attachment:kvyhof0n]

thank you guys so much !
Click to expand...

You need to show your work - indicating exactly where you are stuck, so that we know where to begin to help you.

These problems assume that you know some geometry - like parallel line theorems. If you are starting geometry (and do not know parallel line theorems) then these problems are not suitable for you. Otherwise these are very simple.

for example:

#9

mABC = m<1 + 34° ("<" sign for angle)

120° = m<1 + 34°

m<1 = 86°
 
basically everything. I don't know how to begin solving for the first couple angles. Do you know where I could find the angle and parallel theorems I need? thanks.
 
Consecutive angles in a parm ar Supplemantary, the two angles remain supplementary which means that they add up to 180°.

For - 10) <BCD + <CBA = 180
<BCD = 180 - <CBA
<BCD = 180 - 120
<BCD = 60 degrees

& <BCD = <BCA + <ACD
60 = 20 + <ACD
60 - 20 = <2

40 degrees = <2
 
Ex. 14 ) a & b are parallel ...

70=x (alternate interior angles)

x + y + 45 =180

y = 180 - 45 -70

y = 65 ...( OR BY CORRESPONDING ANGLES)
 
i knew a triangle had 180 degrees and i just couldn't understand 10,11,12 and 17. I probably should have specified that. Thank You So much for all the help. I have a long way to go. I read and understand the theorems and postulates, but I can never put them to use. :?
 
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