Mathematics · Progression
The radii of three concentric circles are in arithmetic progression. If the innermost radius is 7 cm and the outermost is 21 cm, what is the radius of the middle circle?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 114 cm✓
- 210 cm
- 311 cm
- 412 cm
Correct answer
14 cm
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