bearminar2156
30.01.2020 •
Mathematics
Find the surface area of a regular octahedron with edges of 7m
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Ответ:
7 x 7 then add each side
Ответ:
Sn = a(1 - r^n)/(1 - r)
S5 = 600(1 - (1/2)^5)/(1 - 1/2) = 600(1 - 1/32)/(1/2) = 1,200(31/32) = 1,162.5