Circular ring or path: area = pi (R^2 - r^2)

1. A.
   1:2
2. B.
   2:3
3. C.
   3:4
4. D.
   4:5

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1. A.
   139 $m^2$
2. B.
   135 $m^2$
3. C.
   142 $m^2$
4. D.
   150 $m^2$

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1. A.
   $36\%$
2. B.
   $48\%$
3. C.
   $64\%$
4. D.
   $76\%$

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1. A.
   10 m
2. B.
   11 m
3. C.
   12 m
4. D.
   13 m

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1. A.
   $18\%$
2. B.
   $20\%$
3. C.
   $44\%$
4. D.
   $54\%$

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1. A.
   $179.07\ \text{m}^2$
2. B.
   $131.09\ \text{m}^2$
3. C.
   $138.02\ \text{m}^2$
4. D.
   $144.05\ \text{m}^2$

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1. A.
   3:2
2. B.
   2:1
3. C.
   5:4
4. D.
   4:1

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