Slashdot | Trigonometry Redefined without Sines And Cosines

From Slashdot:

Posted by CowboyNeal on Saturday September 17, @09:32AM
from the numbers-and-stuff dept.
Spy der Mann writes "Dr. Norman Wildberger, of the South Wales University, has redefined trigonometry without the use of sines, cosines, or tangents. In his book about Rational Trigonometry (sample PDF chapter), he explains that by replacing distance and angles with new concepts: quadrance, and spread, one can express trigonometric problems with simple algebra and fractional numbers. Is this the beginning of a new era for math?"