# Geometry... another sos...

• Nov 19th 2006, 07:59 PM
eureka
Geometry... another sos...
Hi There;

Help.. help...

Find the 3x3 matrices that represent the following transformation of 2D space:

a) A rotation of -90 degrees about the origin followed by a translation of (3, -4)
b) A translations of (3, -4) followed by a rotaion of -90 about the origin
c) A rotation of -90 degrees abt the point (3, -4)
b) Find the image of A(1,2) under the transformation (a), (b) and (c) respectively.

Thank you.
• Nov 19th 2006, 08:37 PM
CaptainBlack
Quote:

Originally Posted by eureka
Hi There;

Help.. help...

Find the 3x3 matrices that represent the following transformation of 2D space:

a) A rotation of -90 degrees about the origin followed by a translation of (3, -4)
b) A translations of (3, -4) followed by a rotaion of -90 about the origin
c) A rotation of -90 degrees abt the point (3, -4)
b) Find the image of A(1,2) under the transformation (a), (b) and (c) respectively.

Thank you.

Are you sure you are asked to find 3x3 matrices to represent these transformations?

RonL
• Nov 19th 2006, 08:41 PM
eureka
yes.. is 3x3...
• Nov 20th 2006, 04:41 AM
topsquark
Quote:

Originally Posted by eureka
yes.. is 3x3...

In that case, what axes are the 90 degree rotations about?

-Dan