The question can only be answered by assuming that it refers to a regular heptagon. The sum of the internal angles of a n-gon add to (n-2)*180 degrees So the internal angles of a heptagon add to (7-2)*180 = 5*180 = 900 degrees Assuming that the angles are equal, each internal angle is 900/7 = 128.571428.. degrees.
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how to find the measure of angle C in the following triangle
You can use various properties of angles to find the measure of the second angle. For example, if you can see that the two angles form a right angle, then you know they add up to 90°, so you can subtract the known measure from 90° to find the measure of the other.
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