What is the radius of the circle whose area is equal to the sum of areas of two circles whose radii are 20cm and 21 cm?

What is the radius of the circle whose area is equal to the sum of areas of two circles whose radii are 20cm and 21 cm?

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    1. 27m

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    2. 28m

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    3. 29m

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    4. 15m

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    5. 10m