Tentang Kubus

15 Juni 09

Kubus adalah bangun ruang yang memiliki beberapa keunikan dan menurut saya adalah bangun ruang yang spesial dibandingkan dengan bangun ruang yang lainnya. Bangun ruang ini juga bangun ruang yang saya kenal pertama waktu SD dulu dan sangat fasih dengan rumus-rumus yang melekat padanya.
Unsur-unsur dalam kubus:

  • 6 sisi kongruen berbentuk persegi
  • 12 rusuk
  • 8 titik sudut

Keunikan dalam kubus:

  • semua diagonal ruangnya bertemu di pusat bangun tersebut
  • sebuah kubus yang memiliki rusuk a cm maka panjang diagonal sisinya adalah aV2 cm ( V=akar)  dan panjang diagonal ruang adalah aV3 cm.

Rumus-rumus dalam kubus:

  • luas permukaan = 6 x a² (a = rusuk kubus)
  • volume = a³

Demikian tadi sedikit ulasan tentang kubus semoga bisa kasih sedikit pengetahuan buat kalian.

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