Hexagon in circle

Calculate the radius of a circle whose length is 10 cm greater than the circumference of a regular hexagon inscribed in this circle.

Correct result:

r =  35.3126 cm

Solution:

  2π⋅ r=10+6r 2⋅ 3.1415926⋅ r=10+6r  2⋅ 3.1415926⋅ r=10+6⋅ r  0.283185r=10  r=35.31258=35.3126 cm

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