Sum of all interior angles of a polygon
180( n - 2) where n = number of sides in the polygon
now, if n = 19, the polygon has 19 sides, then 180( 19 - 2)
Answer:

Step-by-step explanation:
The area of a sector with measure
and radius
is given by
.
What we're given:
Substituting given values, we get:

Word | know | Unknown
Language| 12 | x
Total | 180 | 28980
Use cross multiply:
12(28980) = 180(x)
347760 = 180x
347760/180=1932
Answer:
Liam can paint 18 bird houses.
Step-by-step explanation:
9/10 divided by 1/20 = 18