Kieran Morrison Posted February 17, 2011 Report Share Posted February 17, 2011 (edited) another topic change, probably an easier one for you guys How do i find area's for a square, triangle, rectangle and pentagon. Square = 4 cm all sides rectangle = 4cm on 2 equal sides, 8 on other 2. pentagon - dont really know how many equal sides triangle - just need to know what to do. Also, when do i need to use pi-r squared? when finding the area of a circle? and how do i use it?? Cheers Edited February 23, 2011 by Kieran Morrison Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted February 17, 2011 Report Share Posted February 17, 2011 Draw yourself a diagram, that will definitely be a good start. Edit: Just realised you've already done one. Well you know A + B + D = 180, so A + B = 151. If it's an isosceles triangle then the answer is obvious... Edit: Question was changed! I'm not a complete retard lol Quote Link to comment Share on other sites More sharing options...
Kieran Morrison Posted February 17, 2011 Author Report Share Posted February 17, 2011 Think i'll just wait to ask my teacher on that one, question about to be changed... Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted February 17, 2011 Report Share Posted February 17, 2011 What does -- mean? Quote Link to comment Share on other sites More sharing options...
Leistonbmx Posted February 17, 2011 Report Share Posted February 17, 2011 Minus negative? Quote Link to comment Share on other sites More sharing options...
Kieran Morrison Posted February 17, 2011 Author Report Share Posted February 17, 2011 What does -- mean? Think its a subtract sign, but its longer than 1 subtract sign in the book so i put 2 just incase it meant anything cheers Quote Link to comment Share on other sites More sharing options...
AndrewEH1 Posted February 17, 2011 Report Share Posted February 17, 2011 (edited) hey, I have a maths exam coming up and need to do revision but im stuck on a question. 1 - If m = 2 and n= 5 find the value of... A) 2n B ) (3m)* C)N* -- 5m* _______ N -- 2m D) 3n** --10n* -- 25n How do i find the value of these? Cheers for any help, I cant ask my maths teacher as we got a 1 week holiday of school. * represents squared. ** represents cubed. Kieran. If I'm reading this right... m = 2, n = 5 A) 2n = 2 x 5 = 10 B ) (3m)2 = (3 x 2)2 = 62 = 36 C) n2 - 5m2 = 52 - 5 x 22 = 25 - 20 = 5 D) 3n3 - 10n2 - 25n2 = 3 x 53 - 10 x 52 - 25 x 52 = 375 - 250 - 625 = - 500 Edited February 17, 2011 by AndrewEH1 Quote Link to comment Share on other sites More sharing options...
ellingtj Posted February 17, 2011 Report Share Posted February 17, 2011 Kieran, Have you actually tried to look up how to do these and answer them yourself? You won't learn how to do them just by copying from people here, you need to practice. The formula questions that you last posted, do you understand how AndrewEH1 got the answers he did? If we set you some similar questions could you do them without outside help? Quote Link to comment Share on other sites More sharing options...
Kieran Morrison Posted February 17, 2011 Author Report Share Posted February 17, 2011 Kieran, Have you actually tried to look up how to do these and answer them yourself? You won't learn how to do them just by copying from people here, you need to practice. The formula questions that you last posted, do you understand how AndrewEH1 got the answers he did? If we set you some similar questions could you do them without outside help? I only asked how to find the value of them so i could do them myself. I'll just ask my teacher about that one, he set us like 10 pages of homework over our 1 week off school. I got most things done though cheers for the help everyone. Quote Link to comment Share on other sites More sharing options...
ellingtj Posted February 17, 2011 Report Share Posted February 17, 2011 I only asked how to find the value of them so i could do them myself. I'll just ask my teacher about that one, he set us like 10 pages of homework over our 1 week off school. I got most things done though cheers for the help everyone. Are you happy with what Anrew has written you are you still unsure? We're only trying to help but I need to know where the problem lies. So to check: In the questions replace the letter n with the number 5 and the letter m with 2 two numbers next to each other with no symbol means multiply (sometimes a . is used instesad of a x (times)) Work out the values in the brackets first, so where it says (3m)* work out the 3 times m part first being 3x2 = 6 then square this number (times itself) (6)* = 6x6 = 36 when you have say a multiple of a number to a power, work out the power part first: so for 5m* work out m* first, with m=2 this is 2* = 2x2 = 4 Then multiply by the 5 5 x 4 = 20 As a side note if you want to write a number to power without the abilty to add what is known as a superscript to put a small 2 above the number, for a squared number, a common way to type it is as 2^2 = 2* = 2x2, or as a cube 2^3 = 2** = 2x2x2 Quote Link to comment Share on other sites More sharing options...
Miles Mallinson Posted February 17, 2011 Report Share Posted February 17, 2011 Are you sitting standard grades? I don't think i could do this and i'm in 5th year, what are the *? total mind fudge for me Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted February 17, 2011 Report Share Posted February 17, 2011 * represents squared. ** represents cubed. Quote Link to comment Share on other sites More sharing options...
Miles Mallinson Posted February 17, 2011 Report Share Posted February 17, 2011 Oh i missed that, it makes alot more sense now Quote Link to comment Share on other sites More sharing options...
JT! Posted February 17, 2011 Report Share Posted February 17, 2011 * represents squared. ** represents cubed. Kieran. Just for future reference, x^2 is x squared, and x^3 is x cubed. Quote Link to comment Share on other sites More sharing options...
Kieran Morrison Posted February 17, 2011 Author Report Share Posted February 17, 2011 Are you sitting standard grades? I don't think i could do this and i'm in 5th year, what are the *? total mind fudge for me Nope, it's credit maths in second year, its the exam to decide if im in credit or general in 3rd year. Quote Link to comment Share on other sites More sharing options...
krazykid009 Posted February 17, 2011 Report Share Posted February 17, 2011 What year is that in English years mate? This is simple level maths in our school, and taught from year 7. The letter is simply a substitution for a number, so just treat it like a normal equation and replace the letters with the numbers given. You been told about Mymaths yet? Your school should have a login for it, and you can use it to help with homeworks. If you haven't been given a login, ask about it in school as it is a great learning aid both in home and in school. James Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted February 17, 2011 Report Share Posted February 17, 2011 Just for future reference, x^2 is x squared, and x^3 is x cubed. Or even x2 and x3. Nope, it's credit maths in second year, its the exam to decide if im in credit or general in 3rd year. It's an exam that you get to take home and use the internet to answer? Christ the Scottish education system has gone downhill since I was there! Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted February 17, 2011 Report Share Posted February 17, 2011 C) n2 - 5m2 = 52 - 5 x 22 = 25 - 20 = 5 Agree with the answer to that one, but not the way it's written out- only because of the way Kieran's written it. C)N* -- 5m* _______ N -- 2m (n2 - 5m2)/(n-2m) =(25-20)/(5-4) =5/1 =5 Quote Link to comment Share on other sites More sharing options...
JT! Posted February 17, 2011 Report Share Posted February 17, 2011 Or even x2 and x3. Witchcraft! Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted February 17, 2011 Report Share Posted February 17, 2011 Witchcraft! Quote Link to comment Share on other sites More sharing options...
Kieran Morrison Posted February 17, 2011 Author Report Share Posted February 17, 2011 It's an exam that you get to take home and use the internet to answer? Christ the Scottish education system has gone downhill since I was there! No no no no, this is just some revision we have to do over our holiday, but its work we have to do and this is one of the things we have to revise over. What year is that in English years mate? This is simple level maths in our school, and taught from year 7. The letter is simply a substitution for a number, so just treat it like a normal equation and replace the letters with the numbers given. You been told about Mymaths yet? Your school should have a login for it, and you can use it to help with homeworks. If you haven't been given a login, ask about it in school as it is a great learning aid both in home and in school. James Dont know what year it is in England, its the year before you do the subjects that you have picked, if that makes sense. We have nursery (2 years) Primary school for 7 years (p1,p2,p3 etc.) and secondary for at the most 6 years. dont know if that helps show what english year im in! Agree with the answer to that one, but not the way it's written out- only because of the way Kieran's written it. Thats the way its written in the book. Quote Link to comment Share on other sites More sharing options...
krazykid009 Posted February 17, 2011 Report Share Posted February 17, 2011 (edited) Just had a look. It's equivalent to Primary 7 when we are taught this. Definitely ask your school about MyMaths though. James Edit: Sounds like you are in English year 9 if you're interested. Edited February 17, 2011 by krazykid009 Quote Link to comment Share on other sites More sharing options...
LukasMcNeal Posted February 17, 2011 Report Share Posted February 17, 2011 If you don't have mymaths I'll happily give you my schools password! I done GCSE early entry and got a B so I got to drop maths so I don't use it any more Quote Link to comment Share on other sites More sharing options...
Leistonbmx Posted February 17, 2011 Report Share Posted February 17, 2011 Sam learning too. Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted February 18, 2011 Report Share Posted February 18, 2011 Thats the way its written in the book. Yeah, no worries- I think Andrew missed that there was a denominator because it was on a different line, not that it matters because it ends up being the same in the end anyway. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.