Circle

FOr today's January challenge, the opportunities are endless. We are surrounded by circles in everyday life ALL OVER THE PLACE. The picture, of a very mundanee erlectric oil radiator has 6 circles on it - and its a radiator!!!

A bit more science behined it thank goodness for the internet!!:

Definition of Circle
Definition: A circle is the set of all points that are the same distance, r, from a fixed point.
General Formula: X 2 + Y 2=r2 where r is the radius

Unlike parabolas, circles ALWAYS have X 2 and Y 2 terms.
X2 + Y2=4 is a circle with a radius of 2 ( since 4 =22)
Remember that a circle is a locus of points. A circle is all of the points that are a fixed distance, known as the radius, from a given point, known as the center of the circle.
Explore the standard equation of a circle using the applet below (Go here for a larger version)

So there you have it!!

What a nice day. A late-ish start to get to the church on time for baby Florence's christening at 09:30 followed by a lovely reception in the family church of the Stanley Kubrik estate - you know of Full Metal jacket and Eyes Wide Shut (that rude TomCruise and Nicole Kidman film) fame.

Now back home, ironing done, blip done, time to retire...Aren't weekends supposed to be relaxing???