Respuesta :
m<SRT = 180 - m<SRJ
m<SRT = 180 - 140
m<SRT = 40
m<SRT + m<STR + m<RST = 180
40 + 8x +4 + 3x + 4 = 180
11x + 48 = 180
11x = 132
x = 12
m<S = 3x + 4
m<S = 3(12) + 4
m<S = 36 + 4
m<S = 40
answer
m<S = 40
m<SRT = 180 - 140
m<SRT = 40
m<SRT + m<STR + m<RST = 180
40 + 8x +4 + 3x + 4 = 180
11x + 48 = 180
11x = 132
x = 12
m<S = 3x + 4
m<S = 3(12) + 4
m<S = 36 + 4
m<S = 40
answer
m<S = 40