Difference between revisions of "2001 AMC 12 Problems/Problem 20"
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label("$A$",A,N); | label("$A$",A,N); | ||
label("$B$",B,SW); | label("$B$",B,SW); | ||
− | label("$C$",C, | + | label("$C$",C,N); |
label("$D$",D,E); | label("$D$",D,E); | ||
+ | pair AB = (A + B)/2, BC = (B + C)/2, CD = (C + D)/2, DA = (D + A)/2; | ||
+ | draw(AB--BC--CD--DA--cycle); | ||
</asy> | </asy> | ||
Revision as of 07:03, 9 May 2011
Problem
Points , , , and lie in the first quadrant and are the vertices of quadrilateral . The quadrilateral formed by joining the midpoints of , , , and is a square. What is the sum of the coordinates of point ?
Solution
We already know two vertices of the square: and .
There are only two possibilities for the other vertices of the square: either they are and , or they are and . The second case would give us outside the first quadrant, hence the first case is the correct one. As is the midpoint of , we can compute , and .
See Also
2001 AMC 12 (Problems • Answer Key • Resources) | |
Preceded by Problem 19 |
Followed by Problem 21 |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | |
All AMC 12 Problems and Solutions |