1080 ~ Well, here's how you can solve that: A triangle's interior has a measurement of 180. A square (and all quadrilaterals, which means a shape with four sides) has a measurement of 360. A pentagon has a measurement of 540. A heptagon has a measurement of 720. All you do to get the total angle measurement of more sided shapes (and in your case polygons) that go up from heptagon as well as below it, all you do is add to get the measurement of a larger interior, or subtract for a smaller interior.
Providing that it is a regular 20 sided icosagon the each interior angle measures 162 degrees
Each interior angle of a regular 45-gon measures 172 degrees
Each interior angle of a hexagon is 120 degrees and there are 6 of them. That would equal 720 degrees.
Normally 4 sides as in a square or a rectangle
Niner.
1080 ~ Well, here's how you can solve that: A triangle's interior has a measurement of 180. A square (and all quadrilaterals, which means a shape with four sides) has a measurement of 360. A pentagon has a measurement of 540. A heptagon has a measurement of 720. All you do to get the total angle measurement of more sided shapes (and in your case polygons) that go up from heptagon as well as below it, all you do is add to get the measurement of a larger interior, or subtract for a smaller interior.
60 60
180 degrees
triangle
Interior angles are 108 degrees.
360 degrees
Any polygon can have an interior angle of 144 degrees. The measurement of an interior angle of a decagon is 144 degrees.
17,460 degrees
60 degrees
1,800 degrees
Providing that it is a regular 20 sided icosagon the each interior angle measures 162 degrees