Maths, Addmaths and Statistics: Post your doubts here!

[asd]

4:25 ..

l1^2:l2^2

2^2:5^2

that should be the answer.

That's the wrong concept
Actually you do it only when the triangles are similar, in this case, they are not.
And no, the answer is 2:5 . Dk where the hell did it come from.

 

[syed1995]

That's the wrong concept
Actually you do it only when the triangles are similar, in this case, they are not.
And no, the answer is 2:5 . Dk where the hell did it come from.

I was doing part a .. lol

 

[asd]

4:25 ..

l1^2:l2^2

2^2:5^2

that should be the answer.

oh wait i was doing part a.. nvm

answer should be 2:5

HOW?!

 

[asd]

I was doing part a .. lol

My bad.
Sorry.

 

[syed1995]

ratio of AX:CX as they share the same line.

I am getting the feeling the triangles are similar.

 

[asd]

ratio of AX:CX as they share the same line?

Is that a fact? or your guess?

 

[syed1995]

Is that a fact? or your guess?

guess .. but i am getting the feeling that this triangle is similar .. give me a minute to look at it clearly.

 

[syed1995]

guess .. but i am getting the feeling that this triangle is similar .. give me a minute to look at it clearly.

erm no idea .. It was my guess that the answer would be 2:5 as there are no other lines available which are in both of those triangles! and those two are sharing a line!

 

[Mayedah]

guess .. but i am getting the feeling that this triangle is similar .. give me a minute to look at it clearly.

Is that a fact? or your guess?

Yes they are similar

 

[asd]

Yes they are similar

They are NOT similar, see carefully.

 

[Mayedah]

No, not stretch. If it was a stretch then there would have been no (6,0) but (6,2) instead. And, the point before y-axis would have moved to further left.
It is ONLY enlargement.

I nt get it still .y wouldnt it be stretch ..?

 

[Mayedah]

They are NOT similar, see carefully.

Yeah but if a triangle lies in another triangles and they ask for ratio of area ...we have to take the lengths of the same line .thts wht my sir tld me !

 

[asd]

I nt get it still .y wouldnt it be stretch ..?

I just explained !
the left vertex will be stretched further to the left, if it was stretch, plus the bottom right vertex shouldn't have gone down, just stretched to the right, because one of the axes has to be invariant. Even if its a double stretch, then a diff result will be obtained, you can try yourself.

 

[asd]

Yeah but if a triangle lies in another triangles and they ask for ratio of area ...we have to take the lengths of the same line .thts wht my sir tld me !

Ok but still im not satisfied until i get a strong reason that should convince me..

 

[Mayedah]

Y cant the line x = -2 be taken as invariant ....?

 

[Mayedah]

Ok but still im not satisfied until i get a strong reason that should convince me..

I solve these question by this method and i get thm right...i know kinda confusing !

 

[asd]

Y cant the line x = -2 be taken as invariant ....?

Oh GOD.
Look at the bottom right vertex. It shouldn't move down and right both at the same time, only in the right direction, because its a one way stretch.

 

[Mayedah]

Oh GOD.
Look at the bottom right vertex. It shouldn't move down and right both at the same time, only in the right direction, because its a one way stretch.

Ok thnx i got it

 

[Dukeofwin]

Ahem!
What is the Inverse of Enlargment of centre (0,0) and scale Factor 3?

 

[Mayedah]

1/9(3 -0)
(-0 3)