1991 AIME Problems/Problem 2
Problem
Rectangle has sides of length 4 and of length 3. Divide into 168 congruent segments with points , and divide into 168 congruent segments with points . For , draw the segments . Repeat this construction on the sides and , and then draw the diagonal . Find the sum of the lengths of the 335 parallel segments drawn.
Solution
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The length of the diagonal is (a 3-4-5 right triangle). For each , is the hypotenuse of a 3-4-5 right triangle with sides of . Thus, its length is .
The sum we are looking for is . Using the formula for the sum of the first n numbers, we find that the solution is .
See also
1991 AIME (Problems • Answer Key • Resources) | ||
Preceded by Problem 1 |
Followed by Problem 3 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 | ||
All AIME Problems and Solutions |