Answer:
160.2857143
Explanation:
1.for the circle with a radius of 7cm:
- multiply 3.14 (or 22 on 7) by the square of 7
- you then get 154
2.for the circle with a radius of 10cm:
- multiply 3.14 (or 22 on 7) by the square of 10
- you then get a mixed fraction of 314 (whole number) and 2 on 7
- if you expand it, it will be 314.2857143
finally you subtract 1 from 2 and you have your answer