12. Find the value of x in the Fig. 8.26 and measure of ZBOC and ZAOC,
C
(6x + 4)
A
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>>In figure, find x . Further find BOC,
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In figure, find ∠x. Further find ∠BOC,∠COD and ∠AOD.
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We know that the sum of all the angles in a straight line is 180
o
∠BOC+∠COD+∠AOD=180
o
.
x+20+x+x+10=180
o
3x+30=180
o
3x=150
o
x=50
o
∠COD=50
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∠AOD=x+10
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=60
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∠BOC=x+20
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=70
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∴ ∠COD=50
o
, ∠AOD=60
o
and ∠BOC=70
o
.
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