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diagonal bidang = 20
diagonal ruang = 10
prisma segidelapan
diagonal bidang = 24
diagonal ruang = 40
maaf kalo salah
*diagonal ruang= n(n-3)
*diagonal bidang=n(n-1)
jdi prisma segi 5
* diagonal ruang = 5(5-3)= 5.2= 10
* diagonal bidang/diagonal sisi= 5(5-1)=5.4= 20
prisama segi 8
* diagonal ruang= 8(8-3)=8.5=40
*diagonal bidang= 8(8-1)=8.7=56
semoga bisa membantu*maaf jika ada kesalahan*