Triangular loop problem

This is a question I got wrong on a test and would like to see if I can get someone to show me how to do it properly. Snapped a pic . See below please. Thanks.

Attached Images
File Type: jpg 1397061439183.jpg (36.0 KB)
File Type: jpg 1397061473682.jpg (51.6 KB)

http://ift.tt/1qiSsV8

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