Answer:
Explanation:
To find out ∠B, we need to find out what is ∠A. We are given one clue that the outer angle of ∠A is 143°. Can we use this clue and find out ∠A? Let's find out!
- => 180 - 143 = ∠A
- => ∠A = 37°
Since we have found ∠A, we can now find ∠B.
- => 61 + 37 + ∠B = 180
- => 98 + ∠B = 180
- => ∠B = 180 - 98
- => ∠B = 82°
Conclusion:
We have finally found out our answer and our answer is '∠B = 82°'.
