-- The two sides of a right <u>angle</u> intersect and make the angle.
So do the sides of any other angle. So they can't be parallel.
-- No two sides of a right <u>triangle</u> ... or any other triangle ...can be parallel.
Http://chestofbooks.com/architecture/Building-Construction-V2/images/Stone-Steps-173.jpg
There ya go
The bacteria population will approach, but never reach, 0
Thanks for the points ur so kinds