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Mathematics 7 Online
OpenStudy (anonymous):

@hartnn Could you check my answer?

OpenStudy (acxbox22):

you are right!

OpenStudy (acxbox22):

you can see that the number of triangles made in the shape is 2 less than the number of sides the shape has 18 sides-2=16 triangles 16 x 180=2880 degrees

OpenStudy (anonymous):

Thank you ! :)

OpenStudy (acxbox22):

np ;)

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