Ring Confusion

Geometry Level 2

I want to wear a ring, so I decided to go to nearby gold shop and ordered to make a ring. Then the gold smith asked me a question as he said he was not good at maths.

He asked, " The ring you want has two circles which is concentric. The length of the chord tangent to the small circle is equal to 20 mm. Can you say me the area of the ring ( which is shaded in the image ) between the two circles so I could coat it ? "

Can you help me to find the area (in mm square) ? Answer up to two decimal places.

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