It is known that the area of a circle with radius RCM is equal to the sum of the areas of two circles with radius 2cm and 3cm=______ ．

The area of a circle with radius RCM is equal to the sum of the areas of two circles with radius 2cm and 3cm, π R2 = 4 π + 9 π = 13 π, r = 13, so the answer is: 13

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11. It is known that the area of a circle with radius RCM is equal to the sum of the areas of two circles with radius 2cm and 3cm=______ ．
12. It is known that the area of a big circle is the sum of the areas of two small circles. If the radius of the big circle is RCM and the radius of the two small circles are 2cm and 3cm respectively, the value of R is obtained
13. It is known that the area of a circle with radius RCM is the sum of the areas of two circles with radius 2cm and 3cm, and the value of R is obtained
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