exam Maths Puzzle Numerical Ability

The sum of the measures of the interior angles of a convex polygon is 2160. find the number of sides of the polygon. please help!

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In a convex octagon, the sum of the mea

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2*sqrt{3y^3} + y*sqrt{27y} - 2y*sqrt{3} Find one set of polar coordinates for the point given in rectangular coordinates. The equation is {{{(2,-3)}}}.