Thursday, October 28, 2010


up next Quadrilaterals
knowing the properties of each.
solving problems with each
constructing each

Friday, October 22, 2010


Construct a Circumcircle (circumcenter.....perpendicular bisectors
Why do they only do two?? The definition/theorem says intersection of 3????

Construct an Incircle (incenter....angle bisectors)
That last step is to help draw the circle.
It touches at a location perpendicular from the point to the side.

Median (needs midpoint)

Altitude (needs a perpendicular)  think of that top point as a vertex
(onlinemathlearning video.... another video   )
3 altitudes intersect (concurrency) and make an orthocenter (& therefor orthocircle)

Midsegment (needs 2 midpointx)

Do you know the definitions of these?

Wednesday, October 6, 2010


Here is a website to help you review the basics of Polygn interior & exterior angles
Remember to start with (n-2)*180
Here is a video.

(tutorvista help   RegentsPrep help)

Thursday, September 16, 2010

Relative error

Here is a short video on calculating relative error
(how far off from the "real" number are you ; in terms of percent)