# maths coursework

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16 years ago
#21
Add me to msn i'm a maths fanatic maybe i can help :P
0
16 years ago
#22
Originally posted by Unregistered
formula for any square on a 10 by 10 grid: 10(n-1)²
where n= length of side

formula for any rectangle on a 10 by 10 grid: 10(l-1)(w-1)

i hope that helps!

does anyone know how to prove the second formula?

Nat
i enclose how i explained it

· For my final rule I will be using the width and the length for the rule.

· In my first rule G (n-1) xy2 I can see that the n is the length and width because the sizes are the same so I can get one of the sizes either length or width and minus it by one.

· I have noticed that on the rectangles the length of the rectangle is one more than the total

2x3

= 20
= 2 x 10

· So I can take one away from the length and now I know that the N in rule one is the width because I have found a rule for the length.

· Then I also need to add to the rule, the grid size I have found out that the grid size also needs to go at the front of the equation like the first rule So the rule is:

G (W-1) L-1

· I put the Length at the end because I have found out what N is.
I have tested the rule here

5x5 cut out in a 10x10 grid should be 160,
So using the rule

10 (5-1) 5-1 => 10x4 = 40x4 = 160 it works here

3x3 cut out in an 8x8 grid should be 32
So using the rule

8 (3-1) 3-1 => 8x2 = 16x2 = 32 it works here

2x3 cut out in a 10x10 grid should be 20
So using the rule

10 (2-1) 3-1 => 10x1 = 10x2 = 20 it works here

These are some the cut outs I have used and the rule works for them therefore my rule is correct.
0
16 years ago
#23
w=width
h=height

w(10h) - 10h - 10w + 10

THIS FORMULA WORKS WITH ANY SQUARE OR TRIANGLE ON A 10 GRID SQUARE!!!!!!!!
0
16 years ago
#24
Argh, god save me...

Ok, so far about 15 people have added me to their MSN, i'm fine with helping people (although i thought the deadline had been reached weeks ago?) but DON'T ADD ME IF YOU JUST WANT ANSWERS. People are adding me, saying, hi - i'm doing the grid thing whats the formula. I don't have a clue what it is you want, or what information you are working with so can't help you. So just an update to say if you want help feel free to add me but don't expect answers without telling me what it is your doing and want cause i'm being flooded
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