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(n - 2) × 180°

where n is the number of sides. As far as I know, tridecagon have 13 sides.

(13 - 2) × 180°

11 × 180° = 1980

Therefore, the measure of the interior angle of a regular tridecagon is

Measure of an/each interior angle of a tridecagon:

= where n = number of sides

=

=

=

-----------------------------------------------------------

To find the sum of the measures of the interior angles of tridecagon:

Sum of interior angles

= 180° (11)

= 1,980°