Both circles have the same center. The circumference of the inner circle is 25.12 millimeters.
1 answer:
Answer:
Step-by-step explanation:
let r be radius of inner circle.
2πr=25.12
πr=25.12/2=12.56
3.14r=25.12
r=12.56/3.14=4
outer radius R=4+4=8 mm
reqd. area=πR²-πr²=π(R²-r²)=3.14(8²-4²)=3.14(64-16)=3.14×48= 150.72 mm²
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