Posted by Joshua on Friday, October 17, 2008 at 6:41am.
Hi guys,
In the question "It is given that P (0, 3), Q(7, 5), R(9, 2) and S are vertices of a square. A circle A passes through the points P, Q, R and S. Find the equation of this circle. Hence or otherwise find the equation of circle B which is the image of A under the reflection about y – axis."
Can someone help me with the part hence or otherwise? I've found that the equation of the circle is x^2 + y^2 9x y 6 =0
Thanks =)

Math  drwls, Friday, October 17, 2008 at 9:06am
Assuming your answer is correct, it can be written
(x  9/2)^2 + (y  1/2)^2 = 106/4
(check my numbers)
The reflection about the y axis would be
(x + 9/2)^2 + (y  1/2)^2 = 106/4

Math  Joshua, Friday, October 17, 2008 at 9:40am
Hi drwls,
Just wondering, does the word "under" in the question influence the question at all?
Thanks for your reply! =)

Math  drwls, Friday, October 17, 2008 at 10:53am
In this mathematics context, "Under the reflection about (an axis)" is the same as saying "after a reflection about (an axis)"
Mathematicions often us the preposition "under" to indicate carrying out an operation. It does not mean "below" in this case.

Math  Joshua, Friday, October 17, 2008 at 10:57am
Thanks drwls for the good explanation =)

Math  mina, Thursday, January 30, 2014 at 9:18pm
jack has 3/4 of a dollar. Maxwell has 1/10 of a dollar. Do they have more or less than $1.oo in all?
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