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Problem 119: (2009 AMC12B, 22)
Parallelogram $ABCD$ has area $1,\!000,\!000$. Vertex $A$ is at $(0,0)$ and all other vertices are in the first quadrant. Vertices $B$ and $D$ are lattice points on the lines $y = x$ and $y = kx$ for some integer $k > 1$, respectively. How many such parallelograms are there? $\textbf{(A)}\ 49\qquad$ $ \textbf{(B)}\ 720\qquad$ $ \textbf{(C)}\ 784\qquad$ $ \textbf{(D)}\ 2009\qquad$ $ \textbf{(E)}\ 2048$
Solution
Exercise 119: Solution
Parallelogram $ABCD$ has area $1296$. Vertex $A$ is at $(0,0)$ and all other vertices are in the first quadrant. Vertices $B$ and $D$ are lattice points on the lines $y=x$ and $y=kx$ for some integer $k>1$. How many such parallelograms are there?
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