Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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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!

cool site...my favorite page on the site is http://www.mathsisfun.com/geometry/symmetry-point.html !

hey back!

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