Penjelasan dengan langkah-langkah:
GARIS dan SUDUT
sudut ECB = sudut DEC + sudut ABC
2x – 10 = 180 – 100 + 30
2x – 10 = 80 + 30
2x = 10 + 110
2x = 120
x = 120°
2
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Penjelasan dengan langkah-langkah:
GARIS dan SUDUT
sudut ECB = sudut DEC + sudut ABC
2x – 10 = 180 – 100 + 30
2x – 10 = 80 + 30
2x = 10 + 110
2x = 120
x = 120°
2
x = 60° ✔