Distance around a circle

Answer Key - Grade 7 Math Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Ren wraps ribbon once around a round plate. The ribbon is 59.66 cm long. The ribbon fit on the first try. What is the diameter in cm? Use π = 3.14. Do not round.

   19
2. 2.

   Tala wraps ribbon once around a round pizza. The ribbon is 103.62 cm long. The ribbon smells like dinner. What is the diameter in cm? Use π = 3.14. Do not round.

   33
3. 3.

   Jun's bike has a wheel 0.5 m across. It rolls 31.4 m without slipping. How many full turns does the wheel make? Use π = 3.14 and do not round.

   20
4. 4.

   Sketch, not to scale. Kira's scooter has a wheel 0.2 m across. It rolls 15.7 m without slipping. How many full turns does the wheel make? Use π = 3.14 and do not round.

   25
5. 5.

   Luz's bike has a wheel 0.6 m across. It rolls 56.52 m without slipping. How many full turns does the wheel make? Use π = 3.14 and do not round.

   30
6. 6.

   Milo's half pizza has a diameter of 38 cm. The other half is already gone. How far is it all the way around, curved edge plus straight edge? Use π = 3.14. Do not round.

   97.66
7. 7.

   Pia's half cookie has a diameter of 4 cm. The chips picked a side. How far is it all the way around, curved edge plus straight edge? Use π = 3.14. Do not round.

   10.28
8. 8.

   Ren's half paper plate has a diameter of 23 cm. How far is it all the way around, curved edge plus straight edge? Use π = 3.14. Do not round.

   59.11
9. 9.

   Tala wraps ribbon once around a plate 21 cm across, plus 15 cm more to tie the bow. How long is the ribbon in cm? Use π = 3.14. Do not round.

   80.94
10. 10.

    Bo wraps ribbon once around a clock face 26 cm across, plus 12 cm more to tie the bow. How long is the ribbon in cm? Use π = 3.14. Do not round.

    93.64