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September 21st, 2012, 12:09 PM  #1 
Newbie Joined: Sep 2012 Posts: 1 Thanks: 0  Sphere inscribed in pyramid
I need help: Sphere is inscribed in right pyramid with equilateral triangle in base.We know : angle of inclination = side of the triangle = a Is it possible express the radius of sphere using a and \alfa? Or do we have to know the? Use trygonometric functions. http://imageshack.us/a/img441/7139/xmjyoo.png 

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