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I disagree with you on 2 and 3
I just guessed on 2 I don't know what they mean
like what is that rule
For Q2, do you know what SAS is short for?
no what is it short fot? thats probably why i cant get it
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.
As aroub says, you want (in both triangles) Side Angle Side in that order
oh so the answer would be G) because it's then angle
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
ok and for number 3 what did i do wrong there?
for Q3, you could look for SSS or SAS. which one of the choices will give you one or the other?
umm A), because it's SAS?
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)
you would need
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
oh got confused there ok so its D
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
ok thanks i just got confused there and for the last one is the answer H)? since its the same thing as before?
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?
it looks like side-angle-angle-side
oh i thought you said option F hold on
f gives you angle-side-angle
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.
so to prove it we have to find ? which has to be side
the answer would be F) because thats side-angle-side-angle
that would work. side-angle-?-angle-?-? ^ | if we can match this side (side EF) with the other triangle, we could use side-angle-side
to match it with the other triangle you could flip EF and have it congruent then you would have s-a-s
yes, side EF matched with HI gives SAS.
ok got it. thanks so much>!
OK. I hope it is not too confusing. A little practice helps.
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
Here is a short video that is helpful http://www.khanacademy.org/math/geometry/triangles/v/finding-congruent-triangles