Question

Find the measure of ∠b ?

Answer 1

Explanation:

• by inspection it is given that b and 81° are inside the parallel angles...
• they are sorted such that now we know they are co-inter.. angles
• b+81°=180 since co-inter... angles are supplementary
• b=180°-81°
• ∴b=99°

Answer 2

Below

Explanation:

b = 180 - 81° (because of the Z angle law)

b = 99°