Area of a triangle from a rectangle (cut-out demo)

Where does the formula for the area of a triangle come from? Watch this little demonstration here.

Thanks for watching!

Video created using Microsoft Movie Maker. Used with permission from Microsoft.

Audio track: "Payday" by Jason Farnham. Used with kind permission via download from the YouTube Free Audio library.

[binodkumarpanda]

Nice way to learn maths. Its really very useful for my practical. Thanks

[willlikespancakes]

Who else is here from agla ———>

Hmmm?