Question

7 sides A) two thousand eight hundred eighty degrees
12 sides B) nine hundred degrees
14 sides C) one thousand eight hundred degrees
18 sides D) two thousand one hundred sixty degrees
match please

Answer 1

sum of interior angles of polygon : 180(n - 2).....n being the number of sides
7 sides.....180(n - 2) = 180(7 - 2) = 180(5) = 900 degrees ... (B)
12 sides...180(n - 2) = 180 (12 - 2) = 180(10) = 1800 degrees (C)
14 sides...180(n - 2) = 180(14 - 2) = 180(12) = 2160 degrees (D)
18 sides...180(n - 2) = 180(18 - 2) = 180(16) = 2880 degrees (A)

any questions ?