In the diagram, each partially shaded circle has a radius of 1 \mathrm{~cm} and has a right angle marked at its centre. In \mathrm{cm}^{2}, what is the total shaded area?
Answer Choices
A. 4 \pi^{2}
B. 9 \pi^{2}
C. 4 \pi
D. 9 \pi
E. 3 \pi
In the diagram, each partially shaded circle has a radius of 1 \mathrm{~cm} and has a right angle marked at its centre. In \mathrm{cm}^{2}, what is the total shaded area?
Answer Choices
A. 4 \pi^{2}
B. 9 \pi^{2}
C. 4 \pi
D. 9 \pi
E. 3 \pi