Qualification > Math

IGCSE MATHS DOUBTS HERE !!!!

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Star xD:

--- Quote from: astarmathsandphysics on October 30, 2011, 05:10:05 pm ---Try this too
An enlargement is always a multiple of the identity matrix

--- End quote ---

Thanks. :)

So, is it okay to multiply the co-ordinates of the object with the scale factor for co-ordinates of the image?

astarmathsandphysics:
yes if the centre of enlargement is the origin. That is what I assumened when I said the matrix for an enlargement is a multiple of the identity.
Notice too that if the scale factor is k, the area is multiplied by k^2

Star xD:

--- Quote from: astarmathsandphysics on October 30, 2011, 05:19:25 pm ---yes if the centre of enlargement is the origin. That is what I assumened when I said the matrix for an enlargement is a multiple of the identity.
Notice too that if the scale factor is k, the area is multiplied by k^2

--- End quote ---

Thanks a lot. :)

daniyal:
pls tell this, A,B,C,D 4 corners of rectangular plot on level grnd. bearing of b from a is 40, and bearing of c from a is 90.

calculate bearig b frm c, a frm c, d frm c!

daniyal:
pls answer soon!

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