Question

What is the sum of the measures, in degrees, of the interior angles of an 18-

sided polygon?
A. 2880
B. 3600
C. 3240
D. 3060

Answer 1

2880

Explanation:

SUM=_-2=

18-2=16

16*180 = 2880 OR

18*160 = 2880 degrees

Answer 2

Option (D)

Explanation:

Sum of interior angles of a polygon is represented by the expression,

Sum of interior angles = n(n - 1)×180°

Here n is the number of sides of a polygon

If n = 18,

Sum of 18 sided polygon = (18 - 1) × 180°

= 7 × 180°

= 3060°

Therefore, sum of interior angles of a 18 sided polygon will be 3060°.

Option (D) will be the answer.