Hey there Sign in to join this conversationNew here? Join for free

C2 Differentiation (optimisation/shapes)

Announcements Posted on
Study Help needs new mods! 14-04-2014
TSR wants you: get involved with Power Hour. 10-04-2014
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    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
    • 4 followers
    Offline

    ReputationRep:
    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.
    • 7 followers
    Offline

    ReputationRep:
    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.
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    (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
    • 2 followers
    Offline

    ReputationRep:
    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.
    • 4 followers
    Offline

    ReputationRep:
    (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
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    (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

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?

    this is what you'll be called on TSR

  2. this can't be left blank
    this email is already registered. Forgotten your password?

    never shared and never spammed

  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By completing the slider below you agree to The Student Room's terms & conditions and site rules

  2. Slide the button to the right to create your account

    Slide to join now Processing…

    You don't slide that way? No problem.

Updated: May 11, 2012
Article updates
Reputation gems:
You get these gems as you gain rep from other members for making good contributions and giving helpful advice.