Distance around a circle

Answer Key - Grade 7 Math Worksheet - Building Confidence

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

1. 1.

   Esme rolls a round hand mirror once along a line. The track is its circumference, about 3.14 diameters long. It waves at every square. How long is the track in cm?

   28.26
2. 2.

   Jun rolls a round plate once along a line. The track is its circumference, about 3.14 diameters long. It is very good at rolling. How long is the track in cm?

   47.1
3. 3.

   Kira rolls a round pizza once along a line. The track is its circumference, about 3.14 diameters long. The pizza is on a very round adventure. How long is the track in cm?

   109.9
4. 4.

   Milo's cookie has a radius of 3.5 cm. Two radii make its diameter, and the circumference is about 3.14 diameters. It is not going to last long. What is the circumference in cm?

   21.98
5. 5.

   Pia's clock face has a radius of 10.5 cm. Two radii make its diameter, and the circumference is about 3.14 diameters. It is always right twice a day. What is the circumference in cm?

   65.94
6. 6.

   Tala lays string once around a round cookie and measures both. The string tickled the chocolate chips. How many diameters long is the string, to the nearest hundredth?

   3.14

7. Read this first

   Use this

   Grid, each square 2 cm by 2 cm. The string, pulled straight along a line, is 31.7 cm long. The hand mirror is 10 cm across.

8. 7.

   Zee lays string once around a round hand mirror and measures both. The mirror watched the whole time. How many diameters long is the string, to the nearest hundredth?

   3.17
9. 8.

   Ari lays string once around a round plate and measures both. The plate held very still. How many diameters long is the string, to the nearest hundredth?

   3.14
10. 9.

    Bo lays string once around a round clock face and measures both. Time did not stop for the string. How many diameters long is the string, to the nearest hundredth?

    3.15
11. 10.

    Esme lays string once around a round pizza and measures both. The string is hungry for answers. How many diameters long is the string, to the nearest hundredth?

    3.15