Maths Competition (1 Viewer)

[PtolemysPenguin]

Woohoo! Is the answer for the L Shaped cake 100? Its a shame i wrote 75 because i miscalculated..

Nope, 80

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[munkaii]

Really? I calculated the trapezium + triangle area to be 200 total. Therefore diving through by 2 to give 100. And the larger triangle ended up being 200.

 

[carpediem]

that comp was so hard near the end i wanted to spew

 

[Slidey]

I think it was far easier (and more enjoyable) than last year's.

 

[PtolemysPenguin]

Really? I calculated the trapezium + triangle area to be 200 total. Therefore diving through by 2 to give 100. And the larger triangle ended up being 200.

I'm not sure I follow. You're saying the bottom left piece has area 200, and the others have areas which sum to 200, so the smaller of them must be 100?

a + b = 200 does not necessarily mean that min(a,b) => 100

Is this what you mean?

 

[munkaii]

Consider this diagram, using the L shaped corner as a pivot point to rotate ur cut until you get the two smaller pieces almost identical.

 

[PtolemysPenguin]

Consider this diagram, using the L shaped corner as a pivot point to rotate ur cut until you get the two smaller pieces almost identical.

Ok, I see what you mean now. The problem with that is that when you rotate that diagonal line around the L-shaped corner, the area of the big bottom-left piece does not stay constant. When the two smaller areas are equal, the gradient of the line is -2.5, and both smaller areas are equal to 80.

 

[munkaii]

Edit: Oh i see my point of error. If its 100, then it means the bottom right forms a square.

 

[3G'sMt5:16]

how about.. b^2-4ac is delta the discriminant... sorry just BORED lol

oh ohhh and ermm... if:

* b^2-4ac > 0 then theres 2 roots or destinct roots
* b^2-4ac = 0 theres only one root or equal loots.. lol loots
* b^2-4ac < 0 then NO REAL ROOTS (unreal number =)
* b^2-4ac < 0 and a>0 then it is a pos. def
* b^2-4ac > 0 and a<0 then it is a neg. def

yarrrr

 

[Trebla]

I got 63/120 for Maths Comp. That miraculously equates to a distinction! WHOA! I only just passed (at 52.5%) and got top 4% of the state! I think the cut off for distinction was like 50/120!!!!!!! Wah that's low......!!! I think 70+/120 got high distinction.
Wow, that test was really hard and challenging for everyone and I thought it was just me screwing up......
What did you guys get?

 

[Trev]

How did you find out? Did your results get sent to your school and they forwarded them to you?

 

[Trebla]

We got the Maths comp certificate/results recently last week.
After asking a few peers what they got, I deduced where the cut offs for distinction and high distinction might be.

 

[Dumsum]

My teacher said I got a credit. This after pulling 1st in the state for the UNSW comp. lol. I'm so random