maths paper 4 HELLLLPPPP

[allysaleemally]

hey please can u explain me question 2 a(iv), maths paper 4 oct 2009

http://www.xtremepapers.me/CIE/Cambridg ... 9_qp_4.pdf

i cant understand if its a shear or a stretch, how to identify it?
thanks

 

[ysh1995]

this doc might help you

-Ysh

 

[Aahmsil]

My explanation

Well if it was a stretch, the triangle would have usually lengthened in one direction only - either parallel to the x-axis or parallel to the y-axis.

In case of a shear, as in the question, the object being sheared would appear to be made of different layers and each layer would have slid a different amount relative to a fixed line.

Simply speaking, if it was a stretch, the co-ordinates of triangle X would be (-1,2), (-4,2) and (-4,7).

However it is also important to accept the possibility that a stretch can take place in more than one direction but fortunately or unfortunately, I don't think that an IGCSE student is required to think to such an extent in that perspective as I've never seen a past paper question on transformations with an object being simultaneously stretched in two or more directions.

So, think simple !!!

Hope that helped !!!

Cheers !!! :good: