the locus of point R such that AR = BR.

this is part c of q2

]]>Edited the email coz Miss thinks this is the reason she got two mails from Nigeria this morning 🙁

]]>Please email me your maths enquiry *one at a time* and I'll try my best to answer asap.

Of course, do be gentle with my inbox ... 🙂

]]>To settle it once and for all,

1. Yes, as Kiroii pointed out, the red is to accentuate/differentiate the loci `P` and `Q` (to tie in with the corresponding colors in the notes below).

And no, Miss Loi doesn't have fetishes of any sort (at least nothing that she'll admit here).

2. For a region with a boundary, as winston pointed out, a solid boundary line means that this boundary is included in the region, and vice versa for dashed line.

Notice the difference in the green inequality statements adjacent to the boundaries in the various diagrams?

P.S. The comment cut-off problem has been solved (somewhat). Basically it's the problem with the < character - the comment will be cut-off beyond this.

For now please use < to replace your < in your comments. It will automatically translate to the 'less than' symbol.

]]>Solid: Included in the locus.

Dotted line: DO NOT count it in!!!

]]>Dotted line used as the boundary cannot touch the line or area would be 21 already.Hence cannot touch the line,and dotted lines used.

If you want area to be less than or equal to 21, then u use a solid line as the line is included as a permitted part for the point to get that area..

]]>A important point i missed out is that the line is dotted because as a boundary 3cm away, we know that if height

]]>