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The sum of the exterior angles of any polygon - no matter how many sides, no matter whether it is convex or concave - is 360 degrees.
180 x (7-2) = 900 degrees Actually that is the formula for interior angles. All figures have a sum of 360 degrees for their exterior angles.
If the polygon (convex or concave) has n sides, then the sum of its interior angles is 180*(n-2) degrees. The sum of its exterior angles is 360 degrees - irrespective of the number of sides.
The sum of all the interior angles is (10-2)x180 degrees. this is 180x8=1440 degrees. The sum of the exterior angles is 360 regardless of the number of sides.
Convex polygons with congruent sides and congruent angles are called regular polygons.