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:
7/8
a-3/4=1/8
make 3/4 into 6/8, they are the same, a-6/8=1/8 you add 6/8 to 1/8 and get 7/8
n°
Your selection is correct. Once again, they are alternate angles, meaning they're equal to one another.
≈ -1.31
