Nilai y
[tex]2y + 10° + y + 10° = 140° \\ 3y + 20° = 140° \\ 3y = 140° - 20° \\ 3y = 120° \\ y = 40 °\\ \\ Besar \: sudut \: BAC \\ y + 10 °\\ 40 °+ 10° \\ 50°[/tex]
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Nilai y
[tex]2y + 10° + y + 10° = 140° \\ 3y + 20° = 140° \\ 3y = 140° - 20° \\ 3y = 120° \\ y = 40 °\\ \\ Besar \: sudut \: BAC \\ y + 10 °\\ 40 °+ 10° \\ 50°[/tex]