Huy The expression 180 X (n - 2) gives the sum of the measures of the angles,
in degrees, of a polygon with n sides.
What is the sum of the measures of the
angles in a polygon with 10 sides?
A. 1,080 degrees
B. 1,440 degrees
c. 1,880 degrees
D. 2,160 degrees

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

step-by-step explanation:

i dont get