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The radius of the two concentric circles is 9 cm and 15 cm. If the chord of the greater circle be a tangent to the smaller circle, then the length of that chord is:
  • a)
    24 cm
  • b)
    12 cm
  • c)
    30 cm
  • d)
    18 cm
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The radius of the two concentric circles is 9 cm and 15 cm. If the cho...
Explanation:
BO=OC=15 cm
OD=9 cm
BD=15292
=24×6
=12 cm
BC=2×12
= 24 cm
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The radius of the two concentric circles is 9 cm and 15 cm. If the chord of the greater circle be a tangent to the smaller circle, then the length of that chord is:a)24 cmb)12 cmc)30 cmd)18 cmCorrect answer is option 'C'. Can you explain this answer?
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