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Mathematics 19 Online
OpenStudy (anonymous):

In a plane, two lines perpendicular to the same line are perpendicular to each other.

OpenStudy (anonymous):

Classify the statement below as always, sometimes or never true:

OpenStudy (johnweldon1993):

Hmm, let the line be |dw:1404490437043:dw| The 2 lines perpendicular to that line would look like |dw:1404490461121:dw| Are those 2 lines perpendicular?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

so is that always true

OpenStudy (johnweldon1993):

|dw:1404490549043:dw| Those lines are perpendicular?

OpenStudy (anonymous):

or sometimes

OpenStudy (anonymous):

yep

OpenStudy (johnweldon1993):

|dw:1404490593297:dw| I'll just leave this graphic up and see if you still agree

OpenStudy (anonymous):

is it possible for you to give me th answer because I have more questions for you

OpenStudy (anonymous):

like

OpenStudy (anonymous):

Classify the statement below as always, sometimes or never true: A line which intersests one of two parallel lines intersects the other also.

OpenStudy (anonymous):

and

OpenStudy (anonymous):

Classify the statement below as always, sometimes or never true: Two planes parallel to the same line are parallel to each other.

OpenStudy (anonymous):

plleaase help me

OpenStudy (anonymous):

i dont agree anymore i see the fault

OpenStudy (mathmate):

When you deal with this kind of problem, choose you own answer, then: If you find at least one case where it is true, then it's either always true or sometimes true. If you find at least one case where it is false, then it is NOT always true. If you find one case of each (true and not true), then it is sometimes true. You'll have to find other ways to decide on the other cases.

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