Question

11. In the given fig. AB and AC are opposite rays. If (a – 3b) = 20°, find Za and Zb.
D
aº
bº
C
A
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Answer 1

Answer:

it is given that

a+b=180........i

and

a-3b=20

subtracting both equations

a+b-a+3b=180-20

4b=160

b=40

put in i

a=140

Answer 2

Where is the figure