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Express R(3) in terms of R(1) and R(2), ...

Express `R_(3)` in terms of `R_(1) and R_(2)`, where the sum of areas of two circles with radii `R_(1) and R_(2)` is equal to the area of the circle of radius `R_(3)`.

A

`R_(3)^(2) + R_(2)^(2) + R_(1)^(2)`

B

`R_(3)^(2) = R_(1)^(2) - R_(2)^(2)`

C

`R_(3)^(2)= R_(1)^(2) + R_(2)^(2)`

D

`R_(3)^(2) + R_(1)^(2) = R_(2)^(2)`

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