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A1B1C1 - равносторонний треугольник в верхнем основании
АА1 - ребро
АО - высота, опущенная из А на ВС = h
A1O - высота призмы = H
OK - высота, опущенная из O на AВ - проекция боковой образующей
А1K - образующая боковой грани
AB=BC=AC=16
h=AO=AB*sin(pi/3)=16*корень(3)/2=8*корень(3)
H=А1О=корень(АА1^2-h^2)=корень(15^2-3*64)=корень(33)
OK=BC/2*sin(pi/3) = 8*корень(3)/2=4*корень(3)
А1K = корень( OK^2+A1O^2) = корень( 3*16+33) = 9
S =AB*А1K+ AC*А1K+BC*AA1=16 * ( 9+9+15) = 528