Step-by-step explanation:
oh boy, the typing or the scan of the question did a lot of strange things in the description.
so, let's write this properly :
the sum S of all interior angles of a polygon with n sides is
S = 180×(n - 2)
in the given example this S = 1,620 (right ?).
so,
1620 = 180×(n - 2)
9 = n - 2
n = 11
the polygon has 11 sides.
Answer:
87.92
In this case we're trying to find circumference
Formula: c = pi×d
The problem says to use 3.14 for pi
c = 3.14 × 28 = 87.92
39/80
Yes, it is harder.
