Symmetric Angles

The correct answer is:
Sublimation

Explanation:
Radius of bigger circle $ \displaystyle {{{r}_{1}}}$
Radius of smaller circle $ \displaystyle {{{r}_{2}}}$ 
Area of the bigger circle $ \displaystyle {{{C}_{1}}}$


Area of the smaller circle $ \displaystyle {{{C}_{2}}}$

Area of the unshaded triangle

Area of the shaded portion
Area of the smaller circle +(Area of semicircle – Area of the triangle )

Hence the area of the shaded region

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