GeoGebra Tutorial 30 – Loci, Roses and Reflections

This is the 30th GeoGebra Tutorial of the GeoGebra Intermediate Tutorial Series. If this is your first time to use GeoGebra, you might want to read the GeoGebra Essentials Series.

In this tutorial, we reflect a point on a unit circle about the x-axis and about the y-axis to form rectangle ABCD. We construct a segment with length equal to the area of the rectangle passing through point B.  One of the endpoints of this segment is at the origin.  As we move the point B along the the circle, the trace of the end point of the segment that not on the circle’s center will form a 4-petal rose.

If you want to follow this tutorial step-by-step, you can open the GeoGebra window in your browser by clicking here.  You can view the output of this tutorial here. Continue reading

Men, Women, and Mathematics

Here is some light reading that will compensate the readings I gave you in last Monday’s carnival.  By, the way, I have no bias against women, this is just for the sake of relaxation. So ladies, please accept my apologies.

General  Statistics

A successful man is one who makes more money than his wife can spend.
A successful woman is one who can find such a man.

She doesn't shop too many items. But the black bag costs $3,000.

A woman worries about the future until she gets a husband.
A man never worries about the future until he gets a wife. Continue reading

GeoGebra Tutorial 31 – Paper Folding Simulation

This is the 31st GeoGebra Tutorial of the GeoGebra Intermediate Tutorial Series. If this is your first time to use GeoGebra, you might want to read the GeoGebra Essentials Series.

In this tutorial, we are going to use GeoGebra to simulate paper folding. We will represent a rectangular piece of paper with corners ABCD and drag the upper right corner (vertex B) anywhere inside the rectangle.

We will use a Point on Object, a which is only available in GeoGebra 4.0 Beta Release, which can be downloaded here. As an alternative, the Point in region tool can be replaced by the New point tool as an alternative in lower versions (see details in the step-by-step instructions). Continue reading

25 GB of free online storage

Update: This service has been reduced to 7GB

Not anymore. If your hard disk or online storage account is running out of space and you have no budget to upgrade, one of the best options to store/back up your files is Window Live’s SkyDrive. SkyDrive has 25GB of free online storage

How do you get one?

Pretty easy. All you have to do is to go to Windows Live and sign up.  Once you are done, log in and hover your mouse to Windows live logo located at the upper left of the Windows Live page, and then choose Skydrive (see figure below).

In Skydrive, you can choose to keep your files on your own, to share it with friends, or to make it public.

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Photo:  Messy Messy by Bare Dreamer.

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