Question

In the given figure ∠ a = 40° , then what is the value of ∠ b

Answer 1

Answer:

b=20

Step-by-step explanation:

if a 40

2a=2(40)=80

5b=180-2a

5b=180-80

5b=100

b=100/5

b=20

Answer 2

Answer:b=20⁰

Step-by-step explanation:

Given a=40⁰

Now 2a+5b=180⁰ (linear sum of angle)

2(40)+5b=180⁰

80⁰+5b=180⁰

5b=100⁰

b=20⁰

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