You see a silhouette of a three-dimensional shape. The silhouette is a circle. Then, you turn to get another view. The new silhouette is still a circle, so you turn again. And again. Every time you look at the shape, you see a circular outline.
Is it a sphere?
Just like the Cartesian bear, but with a change of coordinates.
Picture below :
Well, it was a sunny day, my youngest son wanted to head to the beach to make sandcastles. Why not join in, I thought?
The danger of living with a mathematician is that sometimes your grade 1 writing practice is like this :
Continue reading Writing Practice
When we learn that, say, 2+2=4, is that something really true about the universe, or is it something some caveman made up? Does a cube exist as something more than just a figment of our imagination?
I recently received a tough puzzle as a gift from my brother. The name of the puzzle is “Orchard”, and so far, indeed, it seems quite tough! The first step in solving it is to solve this puzzle :
I just saw this excellent online presentation about creative ways to teach math – it explains (briefly) what’s wrong with the current “linear” method of teaching math, and gives some tips on how to improve matters – even within the current system.
Check it out below :
