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Yes the sides add up to the perimeter. The measurements sometimes appear to be incorrect, but this is due to the rounding of the measurements displayed.
The angles add up to 180 for a triangle. Sometimes they seem to add to 181, but this is due to the rounding of the measurements displayed.
The angles add up to 360 for a quadrilateral. Sometimes they seem to add to 361, but this is due to the rounding of the measurements displayed.
The angles add up to 540 for a pentagon. Sometimes they seem to add to 541, but this is due to the rounding of the measurements displayed.
Triangle angles add up to 180.
Quadrilateral angles add up to 360.
Pentagon angles add up to 540.
Following the pattern of adding 180 when we add a side to a convex polygon, we should expect the hexagon to have 720.
Adding a side to a convex polygon adds 180 to the sum of the angles in a convex polygon. Relating the sum to the sides creates the formula sum of angles = (n-2)*180 where n is the number of sides in the polygon.
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