 icalibear
Can somebody check my geometry homework and help with one question I can't get? PLEASE :(
 schrodinger
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 icalibear
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 aroub
I disagree with you on 2 and 3
 icalibear
I just guessed on 2 I don't know what they mean
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 icalibear
like what is that rule
 phi
For Q2, do you know what SAS is short for?
 icalibear
no what is it short fot? thats probably why i cant get it
 aroub
In 2 they just want to you to choose which triangle can be proven by using "Side Angle Side" and that angle must be between those two sides.
 phi
As aroub says, you want (in both triangles) Side Angle Side in that order
 icalibear
oh so the answer would be G) because it's then angle
 icalibear
side then*
 phi
both triangles share the same side. so that is side. the next angle is 90 degrees, so you have the angle, then the 3rd side is marked congruent
so G is SAS
 icalibear
ok and for number 3 what did i do wrong there?
 phi
for Q3, you could look for SSS or SAS. which one of the choices will give you one or the other?
 icalibear
umm A), because it's SAS?
 phi
Are you reading what I am ? A says PN=SQ those are sides.
the picture gives you 2 sides. You need the 3rd (unmarked) sides to be =, or you need the angle between the marked sides to be equal (SAS means in that order)
 icalibear
you would need
 phi
and angle O is between the 2 marked sides and S is between the 2 marked sides.
It is not angle P= angle S because P is not between the marked sides
 icalibear
oh got confused there ok so its D
 phi
B says ON=QR but in the picture ON is marked with 2 dashes. ON matches the 2 dashes on OS. You would want the unmarked sides to be = (NP=QR) then you could use SSS.
But the answer is D
 icalibear
ok thanks i just got confused there and for the last one is the answer H)? since its the same thing as before?
 phi
choice H would give you angle side angle in the first triangle
what does angle F give you? (remember, you "read" the triangle side angle side angle and so on. If a side or angle is unmarked just say ?
what does angle F give you?
 icalibear
it looks like sideangleangleside
 icalibear
oh i thought you said option F hold on
 icalibear
f gives you anglesideangle
 phi
there are 3 sides and 3 angles. If we start with side DE, it is marked, so we can say
side
angle E is marked. so now we have side angle
side EF is not marked so we have sideangle?
angle F is marked (per choosing option H) so sideangle?angle
now side FD is unmarked: sideangle?angle?
finally, angle D is unmarked: sideangle?angle??
now we need in the exact order sideangleside
but we do not have that, because we have ? in between.
 icalibear
so to prove it we have to find ? which has to be side
 icalibear
the answer would be F) because thats sideanglesideangle
 phi
that would work.
sideangle?angle??
^

if we can match this side (side EF) with the other triangle, we could use sideangleside
 icalibear
to match it with the other triangle you could flip EF and have it congruent then you would have sas
 phi
yes, side EF matched with HI gives SAS.
 icalibear
ok got it. thanks so much>!
 phi
OK. I hope it is not too confusing. A little practice helps.
 icalibear
yeah definitely i just didn't know how i as suppose to read it or what sas stood for or anything so this definitely helped
 phi
Here is a short video that is helpful
http://www.khanacademy.org/math/geometry/triangles/v/findingcongruenttriangles
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