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180= 30 + 2a
150= 2a
75= a ( sudut Q dan R)
terus garis lurus
180-75= 105 derajat x-nya
<Q = <R
Sudut Q dan R dimisalkan y°
<Q + <R + <P = 180°
y + y + 30 = 180°
2y + 30 = 180
2y = 180 - 30
2y = 150
y = 150 / 2 = 75°
Jadi, Sudut Q dan R besarnya = 75°
Karena Sudut R dan x° BERPELURUS, maka :
Sudut R + x° = 180°
75° + x° = 180°
x° = 180° - 75°
x° = 105°
Jadi, Besar Sudut x° = 105° (B.)