Question

angle AOC and angle doc are​

Answer 1

Step-by-step explanation:

∠AOC and ∠BOC form a linear pair.

∠AOC=a and ∠BOC=b

∴ a+b=180

o

[ Linear pair ] ------ ( 1 )

⇒ a−2b=30

o

----- ( 2 )

Subtracting equation ( 2 ) from ( 1 ) we get,

⇒ 3b=150

o

⇒ b=50

o

Substituting value of b in ( 1 ) we get,

⇒ a+50

o

=180

o

∴ a=130

o

Hope its help..

Answer 2

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∠AOC and ∠BOC form a linear pair.

∠AOC=a and ∠BOC=b

∴  a+b=180o          [ Linear pair ]  ------ ( 1 )

⇒  a−2b=30o                              ----- ( 2 ) 

Subtracting equation ( 2 ) from ( 1 ) we get,

⇒  3b=150o

⇒  b=50o

Substituting value of b in ( 1 ) we get,

⇒  a+50o=180o

∴  a=130o