2006 AIME I Problem 1

Attempt Problem 1 of the 2006 AIME I below, then check your answer against the professionally curated solution 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.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

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.

Answer: 84
Concepts:Pythagorean Theoremperimeter
Difficulty rating: 1790
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+CD2DA^2 = AC^2 + CD^2 =765+196=961,= 765 + 196 = 961, giving DA=31.DA = 31.

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

Full Exam

Problem 1 in Other Years