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MATEMATIKA SMA
KELAS X
Ruang dimensi tiga
RUANG DIMENSI TIGA
KUBUS
• Kubus adalah sebuah bangun ruang yang dibatasi oleh
enam bidang datar, masing masing berbentuk persegi
yang kongruen
D C
G
H
F
E
A B
UNSUR-UNSUR KUBUS
MENGGAMBAR KUBUS
Diagonal sisi kubus
• Diagonal sisi kubus
yaitu diagonal yang
terdapat pada sisi-sisi
kubus
• Kubus memiliki 12
buah diagonal
sisi,yaitu
AF,BE,CH,DG,A
• C,BD,EG,FH,AH,DE,BG
dan CF
• Jika panjang rusuk
kubus adalah a maka
panjang diagonal sisi
kubus adalah =
2
a
D C
G
H
F
E
A B
NEXT
Diagonal ruang kubus
• Diagonal ruang kubus
yaitu ruas garis yang
menghubungkan dua
titik sudut yang
berhadapan
• Kubus memiliki 4 buah
diagonal ruang yaitu :
AG,CE,BH dan DF
• Jika panjang rusuk
kubus adalah a, maka
panjang diagonal ruang
kubus =
3
a
D C
G
H
F
E
A B
NEXT
Bidang diagonal kubus
• Bidang diagonal
kubus yaitu bidang
yang memuat dua
buah diagonal sisi
yang sejajar
• Kubus mempunyai
6 buah bidang
diagonal yang
berbentuk persegi
panjang, yaitu
AFGD,BCHE,ACGE,
BFHD,ABGH dan
CDEF
D C
G
H
F
E
A B
BACK
MENGGAMBAR KUBUS
• Untuk menggambar kubus ABCD EFGH ,terlebih dahulu diperhatikan hal-hal
berikut:
• Bidang bagian depan yaitu ABFE,dan bidang bagian belakang yaitu DCGH
digambar berbentuk persegi, karena kedua bidang tersebut letaknya sejajar
dengan bidang gambar yang disebut juga dengan bidang frontal
D C
G
H
F
E
A B
NEXT
Rusuk –rusuk yang letaknya searah dari depan kebelakang
yaitu AD,BC,FG dan EH digambar lebih pendek dari rusuk-
rusuk yang lainnya,walaupun sesungguhnya panjang rusuk-
rusuk kubus adalah sama.rusuk-rusuk AD,BC,FG dan EH
tegak lurus dengan bidang gambar yang disebut juga
dengan rusuk orthogonal
D C
G
H
F
E
A B
BACK

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Ppt dimensi 3

  • 2. RUANG DIMENSI TIGA KUBUS • Kubus adalah sebuah bangun ruang yang dibatasi oleh enam bidang datar, masing masing berbentuk persegi yang kongruen D C G H F E A B UNSUR-UNSUR KUBUS MENGGAMBAR KUBUS
  • 3.
  • 4. Diagonal sisi kubus • Diagonal sisi kubus yaitu diagonal yang terdapat pada sisi-sisi kubus • Kubus memiliki 12 buah diagonal sisi,yaitu AF,BE,CH,DG,A • C,BD,EG,FH,AH,DE,BG dan CF • Jika panjang rusuk kubus adalah a maka panjang diagonal sisi kubus adalah = 2 a D C G H F E A B NEXT
  • 5. Diagonal ruang kubus • Diagonal ruang kubus yaitu ruas garis yang menghubungkan dua titik sudut yang berhadapan • Kubus memiliki 4 buah diagonal ruang yaitu : AG,CE,BH dan DF • Jika panjang rusuk kubus adalah a, maka panjang diagonal ruang kubus = 3 a D C G H F E A B NEXT
  • 6. Bidang diagonal kubus • Bidang diagonal kubus yaitu bidang yang memuat dua buah diagonal sisi yang sejajar • Kubus mempunyai 6 buah bidang diagonal yang berbentuk persegi panjang, yaitu AFGD,BCHE,ACGE, BFHD,ABGH dan CDEF D C G H F E A B BACK
  • 7. MENGGAMBAR KUBUS • Untuk menggambar kubus ABCD EFGH ,terlebih dahulu diperhatikan hal-hal berikut: • Bidang bagian depan yaitu ABFE,dan bidang bagian belakang yaitu DCGH digambar berbentuk persegi, karena kedua bidang tersebut letaknya sejajar dengan bidang gambar yang disebut juga dengan bidang frontal D C G H F E A B NEXT
  • 8. Rusuk –rusuk yang letaknya searah dari depan kebelakang yaitu AD,BC,FG dan EH digambar lebih pendek dari rusuk- rusuk yang lainnya,walaupun sesungguhnya panjang rusuk- rusuk kubus adalah sama.rusuk-rusuk AD,BC,FG dan EH tegak lurus dengan bidang gambar yang disebut juga dengan rusuk orthogonal D C G H F E A B BACK