Bagaimana ketika ada dua garis sejajar kemudian dipotong dengan satu garis lurus?

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​Garis dan Sudut

Gambar ilustrasi

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Perhatikan gambar di samping!

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sudut-sudut sehadap

Perhatikan gambar di samping!

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Sudut-sudut dalam berseberangan

Perhatikan gambar di samping!

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Sudut-sudut luar berseberangan

Perhatikan gambar di samping!

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Sudut-sudut dalam sepihak

Perhatikan gambar di samping!

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Sudut-sudut luar sepihak

jika besar sudut D1 = 110^o maka besar sudut D3 dan E2 adalah ...

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contoh :