
teorema pythagoras
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•
Mathematics
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8th Grade
•
Hard
Ismen 82
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teorema pythagoras
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Pada dasarnya teorema pythagoras sangat sederhana yaitu
kita hanya diminta untuk menghitung panjang sisi dari sebuah segitiga siku-siku dimana sisi lainnya sudah diketahui. Kalaupun sisi lain belum diketahui paling tidak bisa dicari dengan cara lain sebelumnya.
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Sifat teorema phytagoras
Hanya untuk segitiga siku-siku
Minimal 2 sisinya dapat diketahui terlebih dahulu
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Mengidentifikasi sebuah segitiga siku-siku
sisi miring yang disingkat dengan (SM)
sisi alas yang disingkat dengan (SA)
dan sisi tegak yang disingkat dengan (ST).
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Rumus Teorema Pythagoras
c2 = b2 + a2
Atau SM2=SA2+ST2
Atau
Sisi miring kuadrat = sisi alas kuadrat + sisi tegak kuadrat
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Contoh soal teorema pythagoras
Misalkan sebuah segitiga siku-siku seperti pada gambar berikut, dengan panjang sisi l =5, sisi m=4, maka tentukanlah sisi n.
diketahui : sisi miring (SM/b)=5 cm, sisi alas (SA/c)= 4 cm
ditanya n (sisi tegak/ST/a)
jawab : n = 52−42 = 25−16 = 9 = 3
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Tentukan panjang sisi alas segitiga!
ST = 26 cm, SM = 10 cm
SA= ......
SA =
262−102 = 676−100 = 576 = 24
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sisi alas / SA=6 cm, sisi tegak / ST=8 cm
ditanya : sisi miring /SM?
jawab:
SM =
62+82 = 36+64 = 100 =10
teorema pythagoras
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