+1011
he length of a rectangle is shown below:
If the area of the rectangle to be drawn is 90 square units, where should points C and D be located, if they lie vertically below A and B, to make this rectangle?
+118609 Here is the starting point.
Questions for you Nicholas,
1) How long is the interval AB
2) What is the forumla for the area of a rectangle?
+118609 ok you do not acrually need a formula because area is a measurement of squares.
So 1 square unit is a square that has sides 1 unit by 1 unit .
Questions for Nicholas
1) Here is a pic, I want you to tell me how many square units this rectangle that I colour in is.
AND
2) If I put lots of rectangles like this going down the graph, how many will I need to make 90 square units.
+118609 ok you have answered my first question correctly, now answer the second one.
+1011 -4,-6 would be the first plot and then 5,-6 to make 90 square units I belive
+118609 Yep 10 rows (including the one you already have.
So what are the co-ordinates at the bottom ?
+1011 I trying to it is alittle trickey every time I count ten row I end up with this although I had on question the X cordinate line does not count as a row right.
+1011 What are Brakets to???
I dont know if I have read about them before but maybe if you tell me alittle of what they are I will remeber.
+434 Yes that actually is on country we are american so we call this ( ) parentheses. and that { } Brackets
+434 Yes They do when we say pemdas this alwas means () Parentahses in javascript programing which he got confused when you said that we Call these things { } but we call them brackets any way.
+118609 I know in PEDMAS p stands for parentheses but I think that is just being used as a generalisation becasue you can use
( ) or { } or [ ] and they would all be considered the same for order of operation.
But yes I think i have notice other Americans use the words opposite to us (Australians) too. 
+1011 I can call them padmaes if that is what you say you call they are ao we under stand each other
+434 I'm aware you know XD sorry it was the first thing that poped into my mind to use as an example. Yeah I have had a similar casre I never knew germens used a cooma instead of a decimal.
+118609 After you get the points displayed correctly you can tell me
1) What is the length of your rectangle (that is the long side) L=?
2) what is the breadth of your rectangle (that is the short side) b=?
The area was 90 units squared, that was in the question.
3) SO what do you think that the formula for the area of a rectangle might be?
+118609 To answer the question, first you need to work out the distance between the points, which was 9 units.
Then you say 9* what = 90
the 'what' is the other dimension of the rectangle. 9*10=90
so the other side must be 10 units long. (10 rows of 9 little squares)
with that you can work out where the points C and D go 
You already did that :))
+118609 Yea sorry, your answer was incorrect.
I thought you had fixed it.
Look again !
You have to go down a TOTAL of 10 rows (including the one that is already there)
