Question

In the given figure, AOC and BOC
from a linear pair. If a-b=20°.
find the value of a and b​

Answer 1

Answer:

angle AOC + angle BOC=180

a+b=180

a-b=20

2a=200

a=200/2=100

a=100

put a=100in a+b=180

a+b=180

100+b=180

b=180-100

b=80

so values of a,b are 100,80.

Answer 2

As angle AOC + angle BOC = 180
( linear pair )
a-b=20...........1
a+b=180..........2
Adding eq 1 and eq 2 we get

a-b+a+b =180 +20

Cancelling b

2a = 200
a = 200/2
a= 100
Putting value of a in a+ b = 180
We get
100 + b =180
b= 180-100
b = 20