Answer:
Sorry for the wait.
Step-by-step explanation:
5. the two bottom angles are the same btw

6. straight lines are 180

7. another 180

8. 90 degree angle

It's a Dodecagon polygon because it has 12 sides.
Thank you
Answer:
The integral diverges
Step-by-step explanation:
Consider the integral from 0 to infinity of

We can do this in parts

When we substitute limits infinity we find that the values become infinity
Hence the integral diverges
The given improper integral diverges
2x+38=180
2x=142 (or x+x=142 from which 2x=142)
x=71
The unknown angles are each 71
You know this answer is logical as, since two sides are 21 it hints that we are looking at an equilateral triangle, which means two of its angles will be the same