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Pembuktian rumus-luas-lingkaran
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Pembuktian rumus-luas-lingkaran

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  • 1. Kelompok 1234 :
    DwiSuhartono
    SulungPermadi
    PriyoDwi T
    Reno Aji
    Assalamualaikum Wr. Wb
  • 2. PEMBUKTIAN RUMUS LUAS LINGKARAN
    PadawaktukitasekolahdiSekolahDasar, kitapernahmendapatkanrumusluaslingkaran. Akantetapibagaimanakahsebenarnyarumuslingkarantersebutdiperoleh?
  • 3. Rumusluasdaerahlingkarandapatdilakukandengancaramemotong-motonglingkaransehinggamenjadijuring-juringkemudianmembentuknyamenjadi:
    • persegipanjang ,
    • 4. segitiga,
    • 5. belahketupat,
    • 6. trapesium,
    • 7. jajargenjangatau
    • 8. bangun yang lain.
  • Penurunanluaslingkarandengansegitiga
    4 r
    ¼ K
  • 9. Pandang gambartersebutsebagaisegitigasama kaki.
    Segitigasama kaki tersebutadalahbentukan 16 juringdarisebuahlingkaran.
    Denganpanjang alas = 4 busurjuring
    = ¼ kelilinglingkarandan
    Tinggisegitiga = 4 r
    =
    =
    =
    Luassegitiga = ½  alas  tinggi
    = ½  ¼ kelilinglingkaran 4 r
    = ½  kelilinglingkaran r
    = ½  2  r  r

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