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| options are perimeter = 50 cm, area =155.5 cm2 perimeter = 50 cm, area =1,452 cm2 perimeter = 154 cm, area = 155.25 cm2 perimeter = 154 cm, area = 1,452 cm2
Can you tell me the formula for Area of Rectangle?
You have been given Length = 8 cm and Width = 6 cm.. I want to know if you know the formula to find Area of a Rectangle or not?
And please, if you don't know anything I am asking, then say frankly and boldly that you don't know, I am here to make you know everything.. Don't worry about that.. Now, let us have some interaction so that we can both solve it properly and can understand it..
Okay, I tell you, suppose we have a rectangle with its length = l (el) cm and width = w cm..
So, now we need to find its Area, I tell you that Area of any rectangle is given by: Area = Length x Width.. Did you get this?
So, the Rectangle that I have draw with l cm and w cm is having area of: \(Area = l \times w = lw \quad cm^2\)..
Clear upto this? Any doubt?
hm, when i multiply the actual length by the width of my rectangle i come up with 48. Is that how I am supposed to do this?
I am just telling your the basic formulae that we need to solve your original problem..
Yes, Area = 48 cm^2, but that is just one part, we have a lot many parts to do..
Just leave this step for a while, now we come to Perimeter...
What is Perimeter?? It is sum of all the side lengths a rectangle has...
A rectangle has two length sides and two width sides, yes or no?
I thought you went on speaking Japanese while learning rectangles. :P
Okay, so add all the side lengths.. \(Perimeter = l + l + w + w = 2 l + 2w \)
All good till here?
I don't understand the answer. I understand that we are going to be adding the lengths and widths together but what does that end result mean?
Nothing.. We are just adding all the lengths and widths we have.. Now, you try adding all sides of your original question..
I got 28
That is good.. Now this is exactly you are half way done..
Now, read your question last line or last few words, if your rectangle is ENLARGED BY SCALE FACTOR OF 5.5, Right?
It means now your length and width both have been increased by 5.5 cm thereby enlarging it.. Getting this point?
So, 8 has now become (8+5.5 = 13.5) and width has now become (6+5.5 = 11.5).. All good?
yeah, so I will add 13.5 + 13.5 + 11.5 +11.5 , correct?
So, now your rectangle becomes : |dw:1437070820960:dw|
Good yaar, you are faster than light now.. :) Yes add them to get your new Perimeter that you need to find..
So C and D options are cancelled out.. Now find Area as you did earlier..
Area = Length x Width... Just put the values in..
Any mistake have you done?
155.25 cm2 , I believe that's correct.
No, it is all right.. Good, is your option B right??
No, it was A
Sorry, I mean check values in option A again..
Area there is 155.5 or 155.25, have you missed 2 there? I think yes, because your option C has 155.25, you must be missing 2 there..
Both c and a have 155.25 as an option.
That is good.. So, you go with A here , right??
Okay, good but just go with A and then leave it, don't marry it and take to your home.. :P
alright xD , thanks for the help.
Any doubt anywhere??
To summarize the formulae: \(1. \quad Area = Length \times Width\) \(2. \quad Perimeter = 2(Length + Width)\) In case of Rectangle only.. :)
thank you so much I suck at math. Fanned you! :D
Fanning someone does not cost you not I actually need to get fanned.. :)