2006 AIME I Problem 1

Below is the professionally curated solution for Problem 1 of the 2006 AIME I, from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2006 AIME I solutions, or check the answer key.

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Concepts:Pythagorean Theoremperimeter

Difficulty rating: 1790

1.

In quadrilateral ABCD,ABCD, B\angle B is a right angle, diagonal AC\overline{AC} is perpendicular to CD,\overline{CD}, AB=18,AB = 18, BC=21,BC = 21, and CD=14.CD = 14. Find the perimeter of ABCD.ABCD.

Solution:

Triangle ABCABC is right-angled at B,B, so AC2=182+212=765.AC^2 = 18^2 + 21^2 = 765. Triangle ACDACD is right-angled at C,C, so DA2=AC2+CD2=765+196=961,DA^2 = AC^2 + CD^2 = 765 + 196 = 961, giving DA=31.DA = 31.

The perimeter is 18+21+14+31=84.18 + 21 + 14 + 31 = 84.

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