If the difference between the circumference and radius of a circle is 37 cm, using π = 22/7, what is the circumference (in cm) of the circle?
Question and options
If the difference between the circumference and radius of a circle is 37 cm, using π = 22/7, what is the circumference (in cm) of the circle?
- 42 cm
- 46 cm
- 44 cm
- 38 cm
Answer and explanation
Correct answer: C - 44 cm
2*pi*r - r = r(44/7 - 1) = 37r/7 = 37, so r = 7 cm. Circumference = 2*(22/7)*7 = 44 cm.
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