To find the circumference of a circle, we use the formula:
Circumference = 2 × π × radius
The problem tells us to use
π = 3.14.
Here is the step-by-step calculation for each circle:
1. Diameter = 42 yd
* First, find the radius: $42 \div 2 = 21$ yd.
* Calculate circumference: $2 \times 3.14 \times 21$.
* $2 \times 21 = 42$.
* $42 \times 3.14 = 131.88$.
* Answer:
131.88 yd
2. Diameter = 22 ft
* First, find the radius: $22 \div 2 = 11$ ft.
* Calculate circumference: $2 \times 3.14 \times 11$.
* $2 \times 11 = 22$.
* $22 \times 3.14 = 69.08$.
* Answer:
69.08 ft
3. Radius = 17 in
* The radius is already given.
* Calculate circumference: $2 \times 3.14 \times 17$.
* $2 \times 17 = 34$.
* $34 \times 3.14 = 106.76$.
* Answer:
106.76 in
4. Radius = 91 yd
* The radius is already given.
* Calculate circumference: $2 \times 3.14 \times 91$.
* $2 \times 91 = 182$.
* $182 \times 3.14 = 571.48$.
* Answer:
571.48 yd
5. Radius = 40 m
* The radius is already given.
* Calculate circumference: $2 \times 3.14 \times 40$.
* $2 \times 40 = 80$.
* $80 \times 3.14 = 251.2$.
* Answer:
251.2 m
6. Radius = 44 cm
* The radius is already given.
* Calculate circumference: $2 \times 3.14 \times 44$.
* $2 \times 44 = 88$.
* $88 \times 3.14 = 276.32$.
* Answer:
276.32 cm
7. Radius = 32 yd
* The radius is already given.
* Calculate circumference: $2 \times 3.14 \times 32$.
* $2 \times 32 = 64$.
* $64 \times 3.14 = 200.96$.
* Answer:
200.96 yd
8. Diameter = 12.5 ft
* First, find the radius: $12.5 \div 2 = 6.25$ ft.
* Calculate circumference: $2 \times 3.14 \times 6.25$.
* $2 \times 6.25 = 12.5$.
* $12.5 \times 3.14 = 39.25$.
* Answer:
39.25 ft
Final Answer:
1. Circumference = 131.88 yd
2. Circumference = 69.08 ft
3. Circumference = 106.76 in
4. Circumference = 571.48 yd
5. Circumference = 251.2 m
6. Circumference = 276.32 cm
7. Circumference = 200.96 yd
8. Circumference = 39.25 ft
Parent Tip: Review the logic above to help your child master the concept of circumference worksheets.
