The radii of two concentric circles are 12 cm and 6 cm. AB is the diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E in such a way that it forms an angle of 90 degree at E with A. Point A is joined to D. The length of AD is –

The radii of two concentric circles are 12 cm and 6 cm. AB is the diam

1.	The radii of two concentric circles are 12 cm and 6 cm. AB is the diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E in such a way that it forms an angle of 90 degree at E with A. Point A is joined to D. The length of AD is –
A.	8 cm
B.	3√3 cm
C.	6√7 cm
D.	12 cm
Answer» D. 12 cm

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The radii of two concentric circles are 12 cm and 6 cm. AB is the diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E in such a way that it forms an angle of 90 degree at E with A. Point A is joined to D. The length of AD is –
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The radii of two concentric circles are 12 cm and 6 cm. AB is the diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E in such a way that it forms an angle of 90 degree at E with A. Point A is joined to D. The length of AD is –

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