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Circle Circumference - Sample Math Practice Problems

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Complexity=4, Mode=exact

Find the circumference in terms of π and the unit of measurement. Type "pi" in for π so that "7π m" would look like "7pi m".

1.   Circumference:
2.   Circumference:

Complexity=6, Mode=exact

Find the circumference in terms of π and the unit of measurement. Type "pi" in for π so that "7π m" would look like "7pi m".

1.   Circumference:
2.   Circumference:

Complexity=8, Mode=exact

Find the circumference in terms of π and the unit of measurement. Type "pi" in for π so that "7π m" would look like "7pi m".

1.   Circumference:
2.   Circumference:

Complexity=4, Mode=fraction

Find the circumference. Use 22/7 as an approximation for π. A correct answer would look like 14.5 cm (use decimal if necessary).

1.   Circumference:
2.   Circumference:

Complexity=4

Find the circumference. Use 3.14 as an approximation for π. A correct answer would look like 4.78 in.

1.   Circumference:
2.   Circumference:

Answers


Complexity=4, Mode=exact

Find the circumference in terms of π and the unit of measurement. Type "pi" in for π so that "7π m" would look like "7pi m".

#ProblemCorrect AnswerYour Answer
1 Circumference:
Solution
Circumference = π × diameter
C = πd
Plugging values into the equation, we have:
C = π(1 m)
C = 1π m
#ProblemCorrect AnswerYour Answer
2 Circumference:
Solution
Circumference = π × diameter
C = πd
Since we have that the radius is 4 mi, we multiply it by 2 to get the diameter which then is 8 mi.
Plugging values into the equation, we have:
C = π(8 mi)
C = 8π mi

Complexity=6, Mode=exact

Find the circumference in terms of π and the unit of measurement. Type "pi" in for π so that "7π m" would look like "7pi m".

#ProblemCorrect AnswerYour Answer
1 Circumference:
Solution
Circumference = π × diameter
C = πd
Plugging values into the equation, we have:
C = π(5 ft)
C = 5π ft
#ProblemCorrect AnswerYour Answer
2 Circumference:
Solution
Circumference = π × diameter
C = πd
Since we have that the radius is 5 m, we multiply it by 2 to get the diameter which then is 10 m.
Plugging values into the equation, we have:
C = π(10 m)
C = 10π m

Complexity=8, Mode=exact

Find the circumference in terms of π and the unit of measurement. Type "pi" in for π so that "7π m" would look like "7pi m".

#ProblemCorrect AnswerYour Answer
1 Circumference:
Solution
Circumference = π × diameter
C = πd
Since we have that the radius is 5 km, we multiply it by 2 to get the diameter which then is 10 km.
Plugging values into the equation, we have:
C = π(10 km)
C = 10π km
#ProblemCorrect AnswerYour Answer
2 Circumference:
Solution
Circumference = π × diameter
C = πd
Since we have that the radius is 6 ft, we multiply it by 2 to get the diameter which then is 12 ft.
Plugging values into the equation, we have:
C = π(12 ft)
C = 12π ft

Complexity=4, Mode=fraction

Find the circumference. Use 22/7 as an approximation for π. A correct answer would look like 14.5 cm (use decimal if necessary).

#ProblemCorrect AnswerYour Answer
1 Circumference:
Solution
Circumference = π × diameter
C = πd
Since we have that the radius is 7 in, we multiply it by 2 to get the diameter which then is 14 in.
Plugging values into the equation, we have:
C = π(14 in)
C = (22/7) × (14 in)
C = 44 in
Note that the 7 canceled out nicely for this specific radius.
#ProblemCorrect AnswerYour Answer
2 Circumference:
Solution
Circumference = π × diameter
C = πd
Since we have that the radius is 28 m, we multiply it by 2 to get the diameter which then is 56 m.
Plugging values into the equation, we have:
C = π(56 m)
C = (22/7) × (56 m)
C = 176 m
Note that the 7 canceled out nicely for this specific radius.

Complexity=4

Find the circumference. Use 3.14 as an approximation for π. A correct answer would look like 4.78 in.

#ProblemCorrect AnswerYour Answer
1 Circumference:
Solution
Circumference = π × diameter
C = πd
Since we have that the radius is 4 in, we multiply it by 2 to get the diameter which then is 8 in.
Plugging values into the equation, we have:
C = π(8 in)
C = 3.14 × (8 in)
25.12 in
#ProblemCorrect AnswerYour Answer
2 Circumference:
Solution
Circumference = π × diameter
C = πd
Plugging values into the equation, we have:
C = π(4 km)
C = 3.14 × (4 km)
12.56 km
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