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a.diagonal bidang
⇒n(n-1)
⇒8 (8-1)
⇒56
b,bidang diagonal
⇒n(n-3)/2
⇒8(8-3)/2r
⇒20
c,diagonal ruang
⇒n(n-3)
⇒8(8-3) =40
Prisma Segi sepuluh
a.diagonal ruang
⇒10(10-1) = 90
b. bidang diagonal
⇒10(10-3)/2 = 35
c.diagonal ruang
⇒10(10-3) = 70