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# Fingerprint Classification - Arch Patterns

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• RIDGES ENTER UPON ONE SIDE MAKE A RISE OR WAVE IN THE CENTER FLOW OR TEND TO FLOW OUT UPON THE OPPOSITE SIDE
• PLAIN ARCH ROAD TEST ANALOGY RIDE A BIKE ACROSS THE HILL WITHOUT GETTING A FLAT TIRE. RIDGES START AT BOTH SIDES AND SMOOTHLY RISE IN THE CENTER.
• SEVERAL EXAMPLES OF DIFFERENT PLAIN ARCHES.
• TENTED ARCH ANGULAR TYPE: FORMED BY TWO RIDGES MEETING AT AN ANGLE. ONE CONTINUOUS RIDGE CANNOT FORM AN ANGLE. ANGLES MUST BE 90 DEGREES OR LESS.
• ### Fingerprint Classification - Arch Patterns

1. 3. PLAIN ARCH
2. 4. Definition: A PLAIN ARCH is that type of pattern in which ridges enter upon one side, make a rise or a wave in the center and flow or tend to flow out upon the opposite side. Classified as “AA” PLAIN ARCH
3. 5. ARCHES 1 2 3 4 5 6 7 8 9 10 11 12
4. 6. AA PLAIN ARCH
5. 7. AA PLAIN ARCH
6. 8. AA PLAIN ARCH
7. 11. TENTED ARCH
8. 12. A TENTED ARCH is that type of pattern which possesses either an angle, an upthrust or two of the three basic characteristics of the loop. Classified as “TT” TENTED ARCH
9. 13. TENTED ARCHES ANGLE TYPE
10. 14. TT TENTED ARCH
11. 15. UPTHRUST TYPE TENTED ARCHES
12. 16. TT TENTED ARCH
13. 17. TT TENTED ARCH
14. 18. TENTED ARCHES LOOPING TYPE A “looping type” tented arch possesses 2 of the 3 characteristics of a loop pattern (core, delta, count across a looping ridge). D C
15. 19. TT 01 TENTED ARCH
16. 20. TT TENTED ARCH
17. 21. TT TENTED ARCH
18. 22. TT TENTED ARCH
19. 23. TENTED ARCH TT
20. 24. ARCH FREQUENCY
21. 25. Questions?
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