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Karena saling berpelurus maka kedua sudut jika dijumlahkan 180°
Sehingga:
3x + 4x - 26 = 180
7x - 26 = 180
7x = 180 + 26
7x = 206
x = 206/7
x = 29,43
Jadi besar ∠L = 4x - 26
= (4 . 29,43) - 26
= 117,72 - 26
= 91,72°