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Mathematics 16 Online
OpenStudy (amz99):

Q) A long time ago Dulani found an island shaped like a triangle with three straight shores of length 3km, 4km and 5km, He said nobody could come within 1km of his shore. What was the area of his exclusion zone?

Directrix (directrix):

From @StephenLaRocque http://mathcentral.uregina.ca/QQ/database/QQ.09.07/h/awrongo1.html @amz99

Directrix (directrix):

Also, from @jim_thompson5910 http://openstudy.com/study#/updates/513c2f5ce4b01c4790d24e63

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