in the figure , find a+b
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hyunxu:
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1x/2+5(x/2-1)+x+9=180. (linear angles)
1x/2+5x/2-5+x+9 =180
1x+5x/2+4+x=180
6x/2+4+x=180
3x+4+x=180
4x =180-4
4x=176
x=176 /4
x=44
so,5(x/2)=5(44/2)
=110
1x/2=44/2
=22
from the figure,5(x/2)+1x/2=a+b(exterior property)
110+22=a+b
132=a+b
1x/2+5x/2-5+x+9 =180
1x+5x/2+4+x=180
6x/2+4+x=180
3x+4+x=180
4x =180-4
4x=176
x=176 /4
x=44
so,5(x/2)=5(44/2)
=110
1x/2=44/2
=22
from the figure,5(x/2)+1x/2=a+b(exterior property)
110+22=a+b
132=a+b
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