Comments on: Intermediate 2 Revision Questions 3

By: Craig Stebbing

Craig Stebbing — Wed, 19 Nov 2008 14:45:42 +0000

Aidan xXx. I was tucked up in bed by then. Sorry. We’ll go over them in class today. Don’t worry

By: aidan xXx

aidan xXx — Tue, 18 Nov 2008 22:11:39 +0000

hello again

jeeeees! mr steb these are better but i found Q.1 alright
(partly cause mhari told sophie the whole thing by posting it up but still)

meh but i can tdo question 2 its really tough i tried what u said but…

no answer Help
please x x x

By: Mhari

Mhari — Tue, 18 Nov 2008 20:34:53 +0000

Sophs..
For Number One I Shifted around the area sector formula
area sector- angle divided by 360 x Pi Rsquared
soooo…

i ended up with 200 x 360 = angle
PiRsquared

(hope you understand that!….=S)

From using that formula i worked out the answer= 101.86

soo i then found out the circumference.

C=Pi D
Pix30
C= 94.25m

then found out the arc as it asks for…..

arc= 101.86 divided by 360 x 94.25

hey presto…you get your answer….!? i hope haha

Emm…thinking for Q2 though that you need to find out some sort of equation???

By: Craig Stebbing

Craig Stebbing — Tue, 18 Nov 2008 20:30:14 +0000

Wahey. These are nice ones aren’t they. Lets look at Q1. Call your angle X and then put everything you have into the equation you know for area of a sector. You should find you only have x missing and with a bit of dividing and multiplying, out will pop your answer. It sounds as if you’re part of the way there Sophie. SOlve the equation you are left with just as you would solve 3x/2 = 9.

Well Just look at the example and choose another square on the grid. Plug in the values like the example and see what you get. If you don’t get 28 do it again. I did it with 6, 8, 20, 22 and it worked. Try another 3×3 grid.

part B A/B level as you suspect. I would call the number in the top left of the box n, how do the other corners relate to n? top right will be (n+2). What about the rest? Once you have these stick them in like you did for part a). Multiply out your brackets and tidy it up. Again you are aiming for 28 as it tells you in the question.

Particularly difficult I would say but not impossible.

By: Sophie

Sophie — Tue, 18 Nov 2008 20:15:48 +0000

No idea where to even start for number 2!
But for number one, you obviously need the angle to find the length, so i was trying to do how they found the area (angle divided by 360 times pie times radius squared) but… i only get as far as 360 divided by angle multiplied by 2827.43 = 200 and cant remember how to find the angle so i can then find the length of the arc!
These questions are horrible.

By: Mhari

Mhari — Tue, 18 Nov 2008 19:06:04 +0000

Ermm…Im A Bit Stuck On 2b….I Dont Know What Its Asking For When It Asks To Prove Something!?
Since Its Three Marks Aswell….
Please Help !:)
x