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# 3 18-12-2010 , 07:01 PM
Registered User
Join Date: Aug 2008
Location: U.K.
Posts: 223
Thanks elephantinc

That sure is impressive I am finding vectors and matrices harder than modelling user added image

do you know anything about matrices at all could i am struggling with this too?

the basics to vectors are pretty straight forward , but with matrices not got a great deal of knowledge or lit on the topic

I came across these but not sure how to work it out;


A =(1 -2 3) (3 1 5) (0 1 -3) B = ( 1 -8) (-9 8 )(2 4 )


Find A x B


2 (a) write out the rotation matrix that rotates an 2D object counterclockwise by 45 degrees by the coordinate origin.

b) suppose the three vertices of a triangle are A(0,0), B(10,5) and C(5,8) .Where are the vertices after the triangle is rotated counterclockwise 45 degrees by the coordinate origin?

Any help guidance would be greatful


Jt