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Kelas :VIIMapel: Matematika
Kategori: Bab Segitiga dan segiempat
Kata Kunci: sudut, segitiga
Jumlah besar sudut pada segitiga = 180°
A + B + C = 180°
(x+15°) + 2(x+15) + (x+11°) =180°
(x+15°) +( 2x+30°) + (x+11°) = 180°
4x + 56° = 180°
4x = 180° - 56°
4x = 124°
x = 31°