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?

Nickolas Mar 20, 2019

#1**+2 **

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?

Melody Mar 20, 2019

#5**+2 **

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.

Melody Mar 20, 2019

#8

#9**-5 **

-4,-6 would be the first plot and then 5,-6 to make 90 square units I belive

Nickolas
Mar 20, 2019

#12**+2 **

Yep 10 rows (including the one you already have.

So what are the co-ordinates at the bottom ?

Melody
Mar 20, 2019

#15**-5 **

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.

Nickolas
Mar 20, 2019

#16**-5 **

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.

Nickolas
Mar 20, 2019

#26**-3 **

Yes that actually is on country we are american so we call this ( ) parentheses. and that { } Brackets

HiylinLink
Mar 20, 2019

#35**-2 **

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.

HiylinLink
Mar 20, 2019

#36**+2 **

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.

Melody
Mar 20, 2019

#37**-5 **

I can call them padmaes if that is what you say you call they are ao we under stand each other

Nickolas
Mar 20, 2019

#38**-2 **

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.

HiylinLink
Mar 20, 2019

#17**+2 **

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?

Melody Mar 20, 2019

#29**+2 **

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 :))

Melody Mar 20, 2019

#39**+1 **

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)

Melody Mar 20, 2019