Which of the following expressions will find the sum of interior angles of a polygon with 14 sides?
14(180)-2
180(14-2)
180(14)-2
180(14)

Central angle of polygon with 14 sides is:
a = 360/14

that means that interior angle is:
b = (180 - 360/14)/2

because sum of angles in a triangle is 180.
each triangle has 2*b angles and there are 14 angles. so sum of all those angles is:
2*b*14 = (180-360/14)/2*14*2 = 180*14-360 = 180*14 - 2*180 = 180*(14-2)

Answer is second option.

Hnmmmn not sure