icalibear
  • icalibear
Can somebody check my geometry homework and help with one question I can't get? PLEASE :(
Mathematics
schrodinger
  • schrodinger
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icalibear
  • icalibear
aroub
  • aroub
I disagree with you on 2 and 3
icalibear
  • icalibear
I just guessed on 2 I don't know what they mean

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icalibear
  • icalibear
like what is that rule
phi
  • phi
For Q2, do you know what SAS is short for?
icalibear
  • icalibear
no what is it short fot? thats probably why i cant get it
aroub
  • 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
  • phi
As aroub says, you want (in both triangles) Side Angle Side in that order
icalibear
  • icalibear
oh so the answer would be G) because it's then angle
icalibear
  • icalibear
side then*
phi
  • 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
  • icalibear
ok and for number 3 what did i do wrong there?
phi
  • phi
for Q3, you could look for SSS or SAS. which one of the choices will give you one or the other?
icalibear
  • icalibear
umm A), because it's SAS?
phi
  • 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
  • icalibear
you would need
phi
  • 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
  • icalibear
oh got confused there ok so its D
phi
  • 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
  • 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
  • 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
  • icalibear
it looks like side-angle-angle-side
icalibear
  • icalibear
oh i thought you said option F hold on
icalibear
  • icalibear
f gives you angle-side-angle
phi
  • 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 side-angle-? angle F is marked (per choosing option H) so side-angle-?-angle now side FD is unmarked: side-angle-?-angle-? finally, angle D is unmarked: side-angle-?-angle-?-? now we need in the exact order side-angle-side but we do not have that, because we have ? in between.
icalibear
  • icalibear
so to prove it we have to find ? which has to be side
icalibear
  • icalibear
the answer would be F) because thats side-angle-side-angle
phi
  • phi
that would work. side-angle-?-angle-?-? ^ | if we can match this side (side EF) with the other triangle, we could use side-angle-side
icalibear
  • icalibear
to match it with the other triangle you could flip EF and have it congruent then you would have s-a-s
phi
  • phi
yes, side EF matched with HI gives SAS.
icalibear
  • icalibear
ok got it. thanks so much>!
phi
  • phi
OK. I hope it is not too confusing. A little practice helps.
icalibear
  • 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
  • phi
Here is a short video that is helpful http://www.khanacademy.org/math/geometry/triangles/v/finding-congruent-triangles

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