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math specimen paper 4, help please !

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X Abdulrahman X:

--- Quote from: MB on May 16, 2009, 11:56:45 am ---Hey, could someone please help me with number 8?  : )

And how do you rotate about a centre, and how do you reflect about a line? :S

Thanks!



--- End quote ---

umm hard to explain the rotation and reflection part, but imagine u have a point at 2,1 and u rotate it 90 degrees clockwise, the point will be at 1,2 ( i think tracing paper is allowed in the exam and will help alot)

and how dont u know reflections ? :S
imagine u have a line thats at 2,4  to  4,4
and its 4 lines above the X axis/line to reflect that u go down 4 lines and u get the reflection at 2,-4  to  4,-4

MB:
Thanks. I get the direct reflections/rotations. You wouldn't happen to hav November 2001?

If not the question goes like this:

The coordinates of P, Q and R are (4,2), (6,2) and (8,4) respectively,
The points Q and R lie on the line l.
a- find the new coordinates for
i- P, after reflection in the line l,
iii- R, after the rotation of 90 degrees anticlockwise about centre P.

i don't get how to rotate about a centre (in this case P) and how to reflect about a line (apart from the x-axis/ y-axis).

I'm sorry, they're probably really easy but I can't seem to find the formulae.   :-\

X Abdulrahman X:

--- Quote from: MB on May 16, 2009, 12:22:41 pm ---Thanks. I get the direct reflections/rotations. You wouldn't happen to hav November 2001?

If not the question goes like this:

The coordinates of P, Q and R are (4,2), (6,2) and (8,4) respectively,
The points Q and R lie on the line l.
a- find the new coordinates for
i- P, after reflection in the line l,
iii- R, after the rotation of 90 degrees anticlockwise about centre P.

i don't get how to rotate about a centre (in this case P) and how to reflect about a line (apart from the x-axis/ y-axis).

I'm sorry, they're probably really easy but I can't seem to find the formulae.   :-\



--- End quote ---

thres no formulas needed, unfortuanetly i need to see the graph to help cuz i dont know whats meant be line l

yaweng:
howd you guys calculated the 128 minutes?im not good at time..

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