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# Circles practice 1

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Circles Area, Circumference, Arc Length, and Sector

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### Circles practice 1

1. 1. Circles<br />Please complete these problems and include the formulas and all work for full credit<br />
2. 2. Circumference<br />What is the circumference of the circle below?<br />Formula: 2rπ<br />Answer: 43.96 cm2<br />
3. 3. Circumference<br />What is the circumference of the circle below?<br />Formula: dπ<br />Answer: 37.68 in2<br />
4. 4. Arc Length<br />What is the length of arc AB?<br />Formula: m arc/360 x circumference <br />Answer: 3.92<br />
5. 5. Arc Length<br />What is the length of arc XY?<br />Formula: m arc/360 x circumference <br />Answer: 15.63<br />
6. 6. Area<br />What is the area of the circle below?<br />Formula: πr2<br />Answer: 452.16 cm2<br />
7. 7. Area<br />What is the area of the circle below?<br />Formula:πr2<br />Answer: 78.5 ft2<br />
8. 8. Area<br />If the area of a circle is 530.66 cm2 what is the length of the diameter?<br />(use 3.14 for pi)<br />πr2= 530.66 <br />Answer: 13<br />
9. 9. Sectors<br />What is the area of the sector below?<br />Formula: m arc/360 x area<br />Answer: 23.31 <br />
10. 10. Sectors<br />What is the area of the sector below?<br />Formula: m arc/360 x area<br />Answer: 56.22 cm2<br />
11. 11. Nested Circles<br />Find the area of the grey section:<br />Area= 452.16 - 78.5=<br />Answer- 373.66<br />