Area of the figure is a $=\frac{3}{4}$ of area of the circle. Calculate the area of the following figure.

Give your answer as an exact value.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: Area of the figure is a $=\frac{3}{4}$ of area of the circle. Calculate the area of the following figure.

Give your answer as an exact value.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: Area of the figure is a $=\frac{3}{4}$ of area of the circle. Calculate the area of the following figure.

Give your answer as an exact value.