Answer:
122º
Step-by-step explanation:
The interior angles of a heptagon add to 900º. We can write an equation and solve:
- (12x-9)º+(9x+14)º+(133)º+(10x+9)º+(10x)º+(136)º+(10x+5)º=900º
- Combine like terms, 51xº+288º=900º
- Subtract, 51xº=612º
- Divide, xº=12º
Now that we know x, we can find the measure of ∠B:
