M mathe25 Junior Member Joined Oct 13, 2011 Messages 50 Nov 24, 2011 #1 ii have a regular pentagram and i must find S (surface area)of the stained area...i only have r=1...!!! Attachments 220px-Pentacle_2.svg.png 9.5 KB · Views: 18
ii have a regular pentagram and i must find S (surface area)of the stained area...i only have r=1...!!!
G galactus Super Moderator Staff member Joined Sep 28, 2005 Messages 7,203 Nov 24, 2011 #2 See here: http://www.mathalino.com/reviewer/plane-geometry/area-of-regular-five-pointed-star
M mathe25 Junior Member Joined Oct 13, 2011 Messages 50 Nov 29, 2011 #3 galactus said: See here: can someone hel me to prove the formulat for central and iscribed angle ??? Click to expand...
galactus said: See here: can someone hel me to prove the formulat for central and iscribed angle ??? Click to expand...
