exam Maths Puzzle Numerical Ability

Find the area of a regular octagon inscribed in a unit circle

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exam Other Question

A circle centered at the point of origin has a radius of 10. If the point (10,0) is rotated 120 degrees counter-clockwise, determine the coordinates of the new point in exact radical form. The surface of a sphere is 86 pie ft^2? what is the diameter of the sphere?