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".

#	Problem	Correct Answer	Your Answer
1		Circumference:
Solution Circumference = π × diameter C = πd Plugging values into the equation, we have: C = π(1 m) C = 1π m

#	Problem	Correct Answer	Your 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".

#	Problem	Correct Answer	Your Answer
1		Circumference:
Solution Circumference = π × diameter C = πd Plugging values into the equation, we have: C = π(5 ft) C = 5π ft

#	Problem	Correct Answer	Your 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".

#	Problem	Correct Answer	Your 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

#	Problem	Correct Answer	Your 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).

#	Problem	Correct Answer	Your 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.

#	Problem	Correct Answer	Your 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.

#	Problem	Correct Answer	Your 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

#	Problem	Correct Answer	Your 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