Hey there! Sign in to join this conversationNew here? Join for free
 You are Here: Home >< Maths

# C2 Differentiation (optimisation/shapes) Watch

1. For the shapes (optimisation) problems which formulas do you need to know? i.e which shape formulas?

Do not tell me to look at the specification or the official book. I wouldn't be posting here if they were in either of them.

Board: Edexcel
2. Which board is this for? My first thought would be to look in the specification too, so if you haven't found it there then there's not a lot I can suggest. Another option is to take every formula that's come up at least once on a past paper or in a textbook question and treat it as examinable, although that's not the perfect solution.

I know I've always found the volume/surface area of a sphere hard to remember as they're not that obvious, so you can use this rule to help remember them:

To get from area of a circle to circumference, differentiate with respect to r.
To get from volume of a sphere to surface area, differentiate with respect to r.

But note that in general this doesn't work with other shapes.
3. perimeters & areas of: rectangles, squares, triangles, circles and compound shapes of any of them
surface areas and volumes of: cuboids, cylinders and prisms.
It's a test of your calculus skills not your shape skills.
4. (Original post by ttoby)
Which board is this for? My first thought would be to look in the specification too, so if you haven't found it there then there's not a lot I can suggest. Another option is to take every formula that's come up at least once on a past paper or in a textbook question and treat it as examinable, although that's not the perfect solution.

I know I've always found the volume/surface area of a sphere hard to remember as they're not that obvious, so you can use this rule to help remember them:

To get from area of a circle to circumference, differentiate with respect to r.
To get from volume of a sphere to surface area, differentiate with respect to r.

But note that in general this doesn't work with other shapes.
Board is Edexcel
5. Circles and all the other shapes.

But in the MEI board, most of the questions on these come with the formulas like volume/surface area of a cone or something.
6. (Original post by Kravez)
Board is Edexcel
I had a look at their C2 papers for the past few years. You'll need these:

Area of sector
Area of a circle
Volume of cuboid
Surface area of a cuboid
Area of triangle (0.5*base*height and 0.5absinC)
Length of arc
Volume/surface area of a prism/cylinder
Sine rule
Cosine rule
SOHCAHTOA
Pythagorus
7. (Original post by ttoby)
I had a look at their C2 papers for the past few years. You'll need these:

Area of sector
Area of a circle
Volume of cuboid
Surface area of a cuboid
Area of triangle (0.5*base*height and 0.5absinC)
Length of arc
Volume/surface area of a prism/cylinder
Sine rule
Cosine rule
SOHCAHTOA
Pythagorus
Thanks.

Reply
Submit reply
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: May 11, 2012
Today on TSR

### Anxious about my Oxford offer

What should I do?

### Am I doomed because I messed up my mocks?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.