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the best tutorials i've ever read about finding the intersections of vectors is here http://www.tonypa.pri.ee/vectors/start.html . Also, these were written with the idea of coding vectors and collisions in games. enjoy
as fairfax said, change 15pi/2 to 3pi/2 -->then take cos(3pi/2)= 0
regarding
Rhombus:
Diagonals are perpendicular
Opposite sides congruent
Diagonals are perpendicular, in and of itself, does not necessarily prove that a quadrilateral is a rhombus; it could also be a kite(not even a parallelogram)
if Diagonals are perpendicular and Opposite sides congruent then you a rhombus you have!
hmm...i'd go for computer science!
i also like this site--i included it in my online educational directory under math teacher resources...keep up the good work here!
cool site...my favorite page on the site is http://www.mathsisfun.com/geometry/symmetry-point.html !
hey back!
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