Each interior angle is approximately 128.57
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That is only true of a REGULAR heptagon. The question does not state that it is regular.
128.571428 repeating
It is 900/7 = 128.57 degrees (approx).
51 degrees
Any angle that you like.
It is 128.57 degrees (approx). 900/7 degrees, exactly.
128.57 degrees
60 degrees
128.571428 repeating
It is 900/7 = 128.57 degrees (approx).
51 degrees
There is no such thing as a hectogon. A heptagon has 7 vertices. Each exterior angle of a regular heptagon is 360/7 degrees. So each interior angle is 180 - 360/7 = 128.57 degrees (approx).
Any angle that you like.
128.5714286 degrees
A heptagon has 7 sides and 7 angles. The sum of the interior angles is 900°. If the heptagon is a regular heptagon, meaning all sides and angles are congruent, then the formula (180(n-2))/ n gives the individual interior angle measure. "n" is the number of sides in this case. In a regular heptagon, the interior angle measures 128 4/7 degrees.
Each angle is about 51.43 degreesheptagon=7 sides, 7 anglesexterior angles sum=360360/7= about 51.4285
It is 128.57 degrees (approx). 900/7 degrees, exactly.
51.428571° is the measure of an exterior angle of a heptagon. You can always find the measurements of a regular polygon by dividing 360 by the amount of sides.