Sum of all angles of a triangle is 180 degrees
therefore,
(6x-3)+(5x-9)+(x)=180
12x-12=180
12x=180+12
12x=192
x= 192/12
x=16
m∠p = 6x-3= 6* 16-3=93°
m∠Q = 5x-9= 5*16-9=71°
m∠R = x = 16°
Answer:
sum of all angles of a triangle = 180
6x-3+5x-9+x = 180
12x= 192
x =16
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