Question

if m angle a=40 degree, then m angle b?​

Answer 1

Answer:

It has been given that,

⇒ ∠A=∠B−40

o

....(1)

∠A=∠C−50

o

....(2)

Now, in triangle ABC,

∠A+∠B+∠C=180

o

⇒ ∠A+∠A+40

o

+∠A+50

o

=180

o

⇒ 3∠A=180

o

−50

o

−40

o

⇒ 3∠A=90

o

⇒ ∠A=30

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Answer 2

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$\sf \angle \: A \: = \: \angle \: B \: (corresponding \: angle \: )$

$\sf \: therefore \: \angle \: B = 40 \degree$

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