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BIDANG IRISAN

bidang α yang melalui P, Q, dan R pada kubus ABCD.EFGH. Titik P adalah titik pada

perpanjangan BF sehingga BP = BF. Dan Q adalah titik potong pada diagonal AH dan DE.

R titik pada rusuk GH. Sehingga GR:RH = 2:1.
Langkah-langkah:
•   buat kubus ABCD.EFGH
•   Tentukan titik P pada perpanjangan BF,                               R
    shg BP = BF                                                  H                   G
•   Tentukan titik Q pada perpotongan AH                 T
    dan DE
•   Tentukan titik R pada rusuk GH shg GR        E                           F
    : RH = 2:1
•   Perpanjang AB
•   Hubungkan QR dan perpanjang QR
    sampai berpotongan dengan
                                                                                         N
    perpanjangan AB, beri nama titik K                       Q
•   Hubungkan QP
•   Cari titik tembus QP dengan bidang
    ABCD, namai titik tembus itu titik L
•   Hubungkan KL dan perpanjang sampai                                                       M
    berpotongan dengan perpanjangan DC,                                                  C
    namai perpotongan itu titik M                                D   L
•   Hubungkan titik M dengan R dan                   O                               S
    memotong di CG pada titik N
                                             K       A                       B
•   Perpotongan garis KL dengan AD
    disebut titik O. dan perpotongan KL
    dengan BC disebut titik S.
•   Perpanjang OQ hingga memotong EH
    dititik T
•   Hubungkan RTOSN
•   Bidang α yang dimaksud adalah RTQSN




                                                                                 P

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Irisan1

  • 1. BIDANG IRISAN bidang α yang melalui P, Q, dan R pada kubus ABCD.EFGH. Titik P adalah titik pada perpanjangan BF sehingga BP = BF. Dan Q adalah titik potong pada diagonal AH dan DE. R titik pada rusuk GH. Sehingga GR:RH = 2:1.
  • 2. Langkah-langkah: • buat kubus ABCD.EFGH • Tentukan titik P pada perpanjangan BF, R shg BP = BF H G • Tentukan titik Q pada perpotongan AH T dan DE • Tentukan titik R pada rusuk GH shg GR E F : RH = 2:1 • Perpanjang AB • Hubungkan QR dan perpanjang QR sampai berpotongan dengan N perpanjangan AB, beri nama titik K Q • Hubungkan QP • Cari titik tembus QP dengan bidang ABCD, namai titik tembus itu titik L • Hubungkan KL dan perpanjang sampai M berpotongan dengan perpanjangan DC, C namai perpotongan itu titik M D L • Hubungkan titik M dengan R dan O S memotong di CG pada titik N K A B • Perpotongan garis KL dengan AD disebut titik O. dan perpotongan KL dengan BC disebut titik S. • Perpanjang OQ hingga memotong EH dititik T • Hubungkan RTOSN • Bidang α yang dimaksud adalah RTQSN P