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Mathematics 8 Online
OpenStudy (mayankdevnani):

How can we find the value of Sin18° ??? (without using any calculator)

jimthompson5910 (jim_thompson5910):

check out this page (towards the bottom) http://www.andrews.edu/~calkins/math/webtexts/NUMB18.HTM

jimthompson5910 (jim_thompson5910):

also, sin(18) and many other exact constants can be found here http://en.wikipedia.org/wiki/Exact_trigonometric_constants#18.C2.B0:_regular_decagon_.2810-sided_polygon.29

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