2012 Year 9 &10 Mathematics Marathon (3 Viewers)

[SpiralFlex]

Re: 2012 Year 9 &10 Mathematics Marathon

this can be circumscribed in a circle rite?

Yes. Though I am not saying if you're on the right track. But it is good you are trying new things.

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

Yes. Though I am not saying if you're on the right track. But it is good you are trying new things.

Spiral why you do dis to me

Idk I forgot how to prove congruent triangles. I just remember the thingos like SSS ASS (is it? or is it AAS)? I forgot. I don't remember anything in year 9.

 

[SpiralFlex]

Re: 2012 Year 9 &10 Mathematics Marathon

Spiral why you do dis to me

Idk I forgot how to prove congruent triangles. I just remember the thingos like SSS ASS (is it? or is it AAS)? I forgot. I don't remember anything in year 9.

This is why doing questions posted by members will help you expose flaws in your knowledge so you can fix it.

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

This is why doing questions posted by members will help you expose flaws in your knowledge so you can fix it.

I don't know how to do any of the questions posted itt even the year 9 questions

WAIT I THINK I GOT IT

 

[kev-]

Re: 2012 Year 9 &10 Mathematics Marathon

ooo how about this?
Draw a perpendicular line from A to BC, naming the line x. Name the left equal side y, and right equal side z.
sin B = x/y
y=x/sin B
sin C= x/z
z=x/sin C

Given y=z,
x/sin B = x/sin C
Cancel x's, sin C = sin B, so C=B +k180 or something if I recall, but I won't delve into that. Is that elegant enough? hopefully.

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

No i don't lol. I give up bye.

 

[kazemagic]

Re: 2012 Year 9 &10 Mathematics Marathon

draw perpendicular line and use sine? for angle b and c

 

[SpiralFlex]

Re: 2012 Year 9 &10 Mathematics Marathon

I don't know how to do any of the questions posted itt even the year 9 questions

WAIT I THINK I GOT IT

This can be done in with year 9 knowledge easily. Assuming you learnt a bit of plane geometry.

 

[SpiralFlex]

Re: 2012 Year 9 &10 Mathematics Marathon

draw perpendicular line and use sine? for angle b and c

Try it out. It may or may not work. Don't be afraid to explore.

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

This can be done in with year 9 knowledge easily. Assuming you learnt a bit of plane geometry.

I have it's just that I don't remember jack shit.

 

[kazemagic]

Re: 2012 Year 9 &10 Mathematics Marathon

Try it out. It may or may not work. Don't be afraid to explore.

wtf sif it doesnt work

 

[SpiralFlex]

Re: 2012 Year 9 &10 Mathematics Marathon

ooo how about this?
Draw a perpendicular line from A to BC, naming the line x. Name the left equal side y, and right equal side z.
sin B = x/y
y=x/sin B
sin C= x/z
z=x/sin C

Given y=z,
x/sin B = x/sin C
Cancel x's, sin C = sin B, so C=B +k180 or something if I recall, but I won't delve into that. Is that elegant enough? hopefully.

Okay, but not really elegant.

 

[enoilgam]

Re: 2012 Year 9 &10 Mathematics Marathon

I have it's just that I don't remember jack shit.

Just try it, CONFIDENCE.

 

[SpiralFlex]

You'd be amazed at what you discover by just trying.

 

[kazemagic]

sine rule using angles B and C. omg what other methods are there?

 

[Fawun]

Re: 2012 Year 9 &10 Mathematics Marathon

Just try it, CONFIDENCE.

BUT IT WILL BE WRONG WHICH WILL THEREFORE MAKE ME LOOK LIKE A FOOL

inb4ialreadylooklikeone

 

[kev-]

I'm trying the circle method using alternate segment rule... I'm feeling something! ...

 

[Fawun]

sine rule using angles B and C. omg what other methods are there?

? how can you use the sine rule to prove that the angles are equal?

like i only thought you used the rule to find a certain side or angle... damn all that r0te.

 

[enoilgam]

Re: 2012 Year 9 &10 Mathematics Marathon

BUT IT WILL BE WRONG WHICH WILL THEREFORE MAKE ME LOOK LIKE A FOOL

inb4ialreadylooklikeone

I dont understand this - many times you have to get it wrong to learn. You cant win if you dont play the game. This thread is the place to make mistakes.

 

[deswa1]

Re: 2012 Year 9 &10 Mathematics Marathon

BUT IT WILL BE WRONG WHICH WILL THEREFORE MAKE ME LOOK LIKE A FOOL

inb4ialreadylooklikeone

Seriously don't worry about this- we won't laugh at you (well not too hard anyway ). Trust though, any mistake you make, I would have made worse. You should see some shockers I've done, both in maths tests and even on this forum.