D.Kesebangunan pada segitiga

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Mathematics

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9th Grade

•

Hard

Kartini Subekti

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11 Slides • 0 Questions

D.Kesebangunan pada segitiga

By Kartini Subekti

1.Syarat dua segitiga sebangun ;

Perbandingan sisi yang bersesuaian sama ( senilai ) atau sudut - sudut yang bersesuaian sama besar

Perhatikan gambar berikut.

Segitiga PQR dengan TU sejajar QR dapat ditulis TU // QR

Contoh soal 1

2.Garis - garis sejajar pada segitiga

Perhatikan gambar berikut.

Contoh soal 3

Perhatikan gambar berikut

a.Hitung panjang SP

b.Jika ST = 5 cm hitung panjang PQ

3.Rumus - rumus pada segitiga siku - siku

Perhatikan gambar berikut.

Segitiga ABC siku - siku di B dan dibuat garis tinggi ke sisi miring.

BD = garis tinggi ke sisi miring

AC = sisi miring , maka berlaku rumus seperti berikut.

BD ²_{= DC x DA BA}²_{= AD x AC BC}²_{= CD x CA}

Contoh soal 4

Perhatikan gambar berikut.

Hitunglah panjang

a.AC

b.AD

Jawab.

a.AC = 10 cm ( gunakan rumus pythagoras )

b. BA ² = AD x AC

8 ² = AD x 10

64 = 10 AD

AD = 64 : 10

AD = 6,4 cm

Apakah kalian bisa menghitung panjang CD =........? ayo di coba...

D.Kesebangunan pada segitiga

By Kartini Subekti

1.Syarat dua segitiga sebangun ;

Perbandingan sisi yang bersesuaian sama ( senilai ) atau sudut - sudut yang bersesuaian sama besar

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