IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Math => Topic started by: godfather93 on May 07, 2009, 10:26:15 am

Title: maths help needed
Post by: godfather93 on May 07, 2009, 10:26:15 am

can someone please brief me on the properties of shapes (kite, rhombus, square, rectangle, parallelogram, trapezium)
It's extremely urgent!!
Thanks

Title: Re: maths help needed
Post by: astarmathsandphysics on May 07, 2009, 10:35:26 am

Square - equal sides, angles. roational symmetry 4, lines symmetry 4
Rectangle  2 pairs equal paralell  sides, all equal angles. roational symmetry 2, lines symmetry 2
 rhombus all equal sides, 2 paralell pairs, 2 pairs equal angles. roational symmetry 2, lines symmetry 2
 kite 2 pairs equal sides, 1 pair equal angles. roational symmetry 0, lines symmetry 2
paralellogram 2 pairs equal paralell sides, 2 pairs angles. roational symmetry 2, lines symmetry 0
Trapexium 1 pair paralell sides. In general no lines symmetry, no roational symmetry or equal angles

Must leanrn how to draw a table for posts like this

Title: Re: maths help needed
Post by: godfather93 on May 07, 2009, 10:48:37 am

thanks astar!! :D ;) ;D

Title: Re: maths help needed
Post by: godfather93 on May 07, 2009, 11:49:00 am

this question confuses me (physics)
it's question 1 (the paper is attached). the markscheme gives no clear answer.

Title: Re: maths help needed
Post by: sweetsh on May 07, 2009, 11:54:54 am

You have to take readings they are easy =O
a) 0.65A -1.65V
the mass you calculate it by subtracting: 6.58-3.26=3.32g
the volume is 150cm³
the gap between electrodes is 0.8 cm
b)to overcome this problem take the electrodes out of the beaker carefully without changing the length of gap and then measure it by a ruler
c)for me i will answer the -temprature-

Title: Re: maths help needed
Post by: godfather93 on May 07, 2009, 12:00:37 pm

thanks sweetsh! :)
It's just part b that's the problem. how can u ensure that the gap betwee the electrodes doesn't change? :'(

Title: Re: maths help needed
Post by: sweetsh on May 07, 2009, 12:02:50 pm

I checked the mark scheme right now they said :remove the electrodes from the beaker  and a method to ensure the gap remains the same. Actually I dont know not sure. We'll ask astar

Title: Re: maths help needed
Post by: astarmathsandphysics on May 07, 2009, 12:09:20 pm

I will be on a mobile phone for the rest of the day

Title: Re: maths help needed
Post by: godfather93 on May 07, 2009, 12:11:45 pm

oooooohhhh.... right.