If the sum of the areas of two circles with radii $R_{1}$ and $R_{2}$ is equal to the area of a circle of radius $R$,then
- A$R_{1} + R_{2} = R$
- B$R_{1} + R_{2} < R$
- C$R_{1}^{2} + R_{2}^{2} = R^{2}$
- D$R_{1}^{2} + R_{2}^{2} < R^{2}$
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