Out of two concentric circles the diameter of the outer circle is 26 cm and the chord MN of length 2...........

Quantitative Aptitude (CDS) Mensuration 2D

Out of two concentric circles, the diameter of the outer circle is 26 cm and the chord MN of length 24 cm is tangent to the inner circle. The radius of the inner circle is

5 cm

6 cm

8 cm

10 cm

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Explanation:

Radius of the outer circle= ON = 13 cm
PN = PM = 12 cm (Perpendicular from the centre of the circle to the chord bisects the chord)
In right ΔOPN

OP=√(ON²−PN²)=√(13²−12²)

=√169−144=√25=5cm
Thus, the radius of the inner circleis 5 cm

By: Munesh Kumari

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Out of two concentric circles the diameter of the outer circle is 26 cm and the chord MN of length 2...........

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Explanation:

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