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Unlike most multicaches, for this one you'll have to find and record the coordinates for three WPs, one of which is already given at the top of this page. Then think about what plane geometry figure is defined by three points...
All the information you need and the final cache are located in Luther Burbank Park on Mercer Island. The find will require a walk of almost a mile and perhaps a second visit to the park depending on how you solve this. Here are a few suggested methods:
Map the points using GPSr software
Solve for the final coords using Analytic Geometry
Draw the points and shape on a CAD system
Use just your GPSr and measure distances to the WPs
(The 2nd and 3rd method will be more accurate if you convert to a coordinate plane first - see hints)
Good luck and have a great time enjoying the view from WP1 and WP2!
[WP1] Haqre J fvqr bs orapu
[WP2] AR Qbpx raq haqre jbbq envy J fvqr
[Solving hint] L-L1 = z(K-K1)
[Solving help] jjj.atf.abnn.tbi/GBBYF/fcp.ugzy
[Giveaway] Guerr JCf qrsvar n pvepyr, svaq gur pragre!