Two circles of same radius 6 cm, intersect each other at P and Q. If PQ = 10 cm, then what is the distance between the centres of the two circles? 

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SSC CGL 2023 Tier-I Official Paper (Held On: 19 Jul 2023 Shift 1)
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  1. 10 cm
  2. 8 cm
  3. 6√11 cm
  4. 2√11 cm

Answer (Detailed Solution Below)

Option 4 : 2√11 cm
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Detailed Solution

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Calculation:

According to the given picture, O1 and O2 be the centres of the two circles,

The line joining the centers O1O2 bisect PQ at R

So, the ΔPROis a right-angle triangle, right angle at ∠R

From Pythagoras theorem,

O1R = √(62 - 52)

⇒ O1R = √11

Now, distance between O1 and O2 is 2 × O1R = 2√11 cm

∴ The correct answer is 2√11 cm

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