Demento's Year 10 maths practice paper thread (4 Viewers)

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

Haha, sorry about that. It's not the sides (i indicated that they're parallel). The 2 dots suggest the two angles are equal in the diagram.

idgi

So can I just replace the second line in my proof with "Angle BAC = Angle BDC (given)" and make it AAS lol

 

[HSC2014]

Re: 2012 Year 9 &10 Mathematics Marathon

fuck you -_-

Also, for question 2 b, is this right for the proofs?

In Triangle BAC and CBD,

Angle BDC = Angle CBA (alternate angles are equal in parallel lines)
BA = DC (given)
BC is common

Therefore, Triangle BAC and CBD are congruent (SAS)

????

First line you made a typo.
Second line is wrong. It is given that they are parallel, nothing more.
Third is fine.

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

BA is parallel to DC... not equal

lol my bad

same shit

 

[HSC2014]

Re: 2012 Year 9 &10 Mathematics Marathon

idgi

So can I just replace the second line in my proof with "Angle BAC = Angle BDC (given)" and make it AAS lol

Yes.

 

[Demento1]

Re: 2012 Year 9 &10 Mathematics Marathon

First line you made a typo.
Second line is wrong. It is given that they are parallel, nothing more.
Third is fine.

Fawun read this ^.

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

First line you made a typo.
Second line is wrong. It is given that they are parallel, nothing more.
Third is fine.

oh my gosh this thing is so frustrating

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

i give up

 

[theind1996]

Re: 2012 Year 9 &10 Mathematics Marathon

Wait did I do question f correct?

m^4 - 5m^2 + 4 = 0

m^4 - 5m^2 = -4

m^2 (m^2 - 5) = -4

m^2 = -4 (no solution)

m^2 - 5 = -4

and then solve for m?

failing this hard

solve the quadratic by subbing in a letter as m^2 (like u or z or w/e).

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

solve the quadratic by subbing in a letter as m^2 (like u or z or w/e).

m8 i already got that question lolwat

 

[kazemagic]

Re: 2012 Year 9 &10 Mathematics Marathon

k

dat subtle rejection

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

dat subtle rejection

for b part 2, do you use pythagoras

 

[kazemagic]

Re: 2012 Year 9 &10 Mathematics Marathon

for b part 2, do you use pythagoras

yea u can

 

[Demento1]

Re: 2012 Year 9 &10 Mathematics Marathon

for b part 2, do you use pythagoras

Umm, I don't recall the Q asking for this.

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

yea u can

ok guise i got dis

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

Umm, I don't recall the Q asking for this.

I meant using pythagoras to find the height so I can use the area (height x base) for the parallelogram

 

[HSC2014]

You will come to realise Fawun that a math question can be tackled in countless of ways, and answered correctly. It's just about finding the most efficient way. Personally I didn't use pythag but it could? work. Just briefly looking at the question I'm going to say that its invalid, but meh. Maybe

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

I meant using pythagoras to find the height so I can use the area (height x base) for the parallelogram

lol my bad didn't read question properly

 

[kazemagic]

Re: 2012 Year 9 &10 Mathematics Marathon

I meant using pythagoras to find the height so I can use the area (height x base) for the parallelogram

w8 nvm u cant use pythagoras, it doesnt say its a right angled triangle LOL

 

[Fawun]

Area = 1/2 x 10 x 7 x sin30

???

 

[HSC2014]

Area = 1/2 x 10 x 7 x sin30

???

Too easy