The Oregon Surveyor | Vol. 38, No. 3 8 PLSO Puzzler e return of the PLSO Crossword Puzzle „ Greg Crites, PLS Across 2. Elevation reference (9) 4. Disposal of right, title or interest in real property (9) 6. Stone marked with an X (8) 7. Oral testimony (5) 8. GPS manufacturer (7) 10. Exercising eminent domain (6) 11. Bearing tree (9) 13. Oldest conveyance (6) 16. Mapping a water boundary (7) 18. Part of a section (7) 19. National coordinate system (3) 20. Spherical coordinate system centered on our planet (4) Down 1. Measuring tool used by GLO (5) 3. Distribution of errors relative to record values (10) 5. Neighboring owner (8) 9. Possessory interest in real property (11) 12. The North Star (7) 14. Description of means and methods for performing a boundary survey (9) 15. Constellation where the North Star resides (5) 17. Center of aerial photograph (5) is crossword puzzle was created with EclipseCrossword. Try it today—it’s free! Surve y terms Answers on the inside back cover. Last issue’s PLSO PUZZLER solution „ John atcher, PLS Here are two ways you can approach the solution: Trial and error. Pick a random R1, compute R2, then compute and subtract the two circle areas. Do it again with dierent numbers. Do you get the same dierence in area? Treat it as a limit problem. Imagine the inner circle getting smaller and smaller. What is the limit of R2 as R1 approaches zero? Why, it’s 46.865! e chord becomes the diameter of the big circle: 93.73. What a coincidence. e area of a circle of radius 46.865 is the same as the dierence in No. 1 above. Isn’t math perfectly beautiful?
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