51º per interior angle
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the answer is 22,97
You work out the sum of the inside angles by taking the number of sides of the shape minus two, then multiplying that by 180. For example, a quadrilateral has four sides, so you take away two from four and get two. Multiply two by 180 and you get 360˚. For each inside angle, if it is regular (a square) divide 360 by four (the number of angles) and you get 90˚. For an outside angle, do 360 (the degrees of a full circle) minus 90 (inside angle). You get 270˚. The sum of the outside angles is then 270 times four - 1080˚. Get the idea? So, a seven sided shape has seven sides (duh). Minus two is five. Five times 180 is 900˚. If it is a regular shape, divide 900 by seven (it isn't a whole number - sorry), and that is one inside angle. If you want the OUTSIDE angles, find each inside angle then take that away from 360. Times by seven for the sum of the outside angles. This was a very long way of explaining, but I didn't know what type of angle you wanted! Hope it makes sense!!! ;)
A heptagon or a septagon. Equal-sided shapes are called "regular" so a seven equal sides shape is a regular heptagon.square square
A seven sided figure would be a heptagon. A Reuleaux heptagon, is a seven sided figure, but having constant diameter. [As seen in some British coins]. But a regular heptagon would have seven equal sides that were each straight.
There can be 14 lines in a seven side shape * * * * * That is the total number of diagonals from ALL vertices. Not what the question asked, though. From one vertex, there can be 4. One to every other vertex except for itself and one each on either side.