Radius sum =37.68÷2÷3. 14=6 cm.

Radius difference =2 cm

So:

Radius of excircle = (6+2) ÷ 2 = 4cm.

Radius of inner circle = 4-2 = 2cm

Annular region

=3. 14×(4×4-2×2)

=37.68 square centimeters

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