[tex]\measuredangle : \ a=2\cdot \measuredangle \ b \\\measuredangle : \ b \\\\\measuredangle \ a +\ \measuredangle \ b = 132^o \\2b+b=132 \\3b=132 \ \ | \ divide \ both \ sides\ by\ 3 \\\\\measuredangle \ b=44^o \\\measuredangle \ a=2\cdot 44^o=88^o[/tex]
