Sunday, August 31, 2008

Soal... (i)

Posted by hendry_dext

Berikut diberikan 3 contoh soaL yang mudah....
1. \triangleABC siku-siku di A. E titik tengah AB. D titik tengah AC. BD=4 cm, dan CE=5 cm. Hitunglah panjang BC!


2. ABCD persegi panjang dengan TB=7 cm, TC=5 cm, TD=3cm.. Hitunglah nilai x!
3. Tentukan panjang jari-jari lingkaran terkecil pada gambar di bawah ini (r)!
Di sini, aku beri 3 soal dulu.. Soal ini memank gampang, karena ini soal SMP kelas 2. Ayo silakan jawab di comment.. .. Jawabanny akan kupost jika ada yang berhasil jawab dgn betuLL..

11 comments:

  1. AnonymousNovember 19, 2008 at 10:44 AM

    no1. jawabannya 6 cm :D

    erikson a.k.a Qson

    ReplyDelete
  2. AnonymousNovember 19, 2008 at 12:18 PM

    no2. x = V33

    no3. r = 7(V2 - 1)

    sekian :D

    Qson

    ReplyDelete
  3. hendry_dextNovember 19, 2008 at 6:19 PM

    Hihihi.. Kegampangan kalii yachh.. ^^

    ReplyDelete
  4. AnonymousDecember 8, 2008 at 12:30 AM

    halo...
    masa' yang nomor 1 jawabannya 6 cm?

    ReplyDelete
  5. hendry_dextDecember 8, 2008 at 1:45 AM

    This comment has been removed by the author.

    ReplyDelete
  6. hendry_dextDecember 8, 2008 at 1:52 AM

    Aku belom cek yang nomor atu sih.. XD

    Mis: AD=DC=x dan AE=BE=y
    Maka, akan ada 2 persamaan:
    x^2+4y^2=16 ... (i)
    4x^2+y^2=25 ... (ii)

    Setelah dieliminasi, didapat bahwa: x^2=5,6 dan y^2=2,6.

    Maka, BC^2= 4(x^2+y^2) = 32,8.
    Jadi, BC=√(32,8).. ^^

    ReplyDelete
  7. AnonymousDecember 8, 2008 at 9:59 PM

    nah..itu baru bener..
    trus no 3 bukannya 14/3 ya?klo salah,minta jawabannya donk.thanx

    ReplyDelete
  8. hendry_dextDecember 25, 2008 at 10:22 PM

    (7+r)^2=(14-r)^2+7^2

    So, r=14/3.. That's correct.. ^^

    ReplyDelete
  9. AnonymousMay 30, 2012 at 6:16 PM

    bisa dijelasin cara untuk no 3

    ReplyDelete
  10. AnonymousMay 31, 2012 at 10:06 AM

    no 2 itu pake apa ya kalo hukum kosinus kok rasanya ada yg kurang

    ReplyDelete
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    ReplyDelete

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