Question

What is the value of b?


36

63

40
75

Answer 1

`\boxed{b\degree = 36\degree}`

Explanation:

Property used: An exterior angle of a triangle is equal to the sum of the opposite interior angles.

`= > 81 \degree + b \degree = 117 \degree \\ \\ = > b \degree = 117 \degree - 81 \degree \\ \\ = > b \degree = 36 \degree`