Do it your self. Subtract 2 by the number of sides. Then multiply it by 180. Learned that in 6th Grade.
Only when it is a regular polygon that all interior angles are of equal measure
Only if the polygon is "regular".
The interior angles add up to 1800 degrees
No.
Measure them with a protractor
The sum of the interior angles of a polygon with n sides is (n-2)*180 degrees = 14*180 = 2520 deg
It will have 16 interior angles that add up to 2520 degrees and each interior angle will measure 157.5 degrees
Only when it is a regular polygon that all interior angles are of equal measure
a convex polygon has 6 sides . What is the sum of the measure of its interior angles?
Only if the polygon is "regular".
octagon
The interior angles add up to 12,240 degrees
The interior angles add up to 1800 degrees
The sum of the interior angles of a 12 sided polygon add up to 1800 degrees.
Only if the polygon is a "regular" one.
The interior angles of an octagon add up to 1080 degrees
For any polygon of N sides, the sum of the interior angles (in degrees) is 180*N-360, which for N=20 is 3240°