Mathematics · Geometry
Three concentric circles have their radii in arithmetic progression. If the smallest circle has a circumference of 4π cm and the largest circle has a circumference of 14π cm, what is the circumference of the middle circle?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 18π cm
- 29π cm✓
- 312π cm
- 411π cm
Correct answer
9π cm
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