A chord of length 30 cm is at a distance of 8 cm from the

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A chord of length 30 cm is at a distance of 8 cm from the centre of a circle. The radius of the circle is:

1. 17 cm
2. 23 cm
3. 21 cm
4. 19 cm

Correct Option: A

AD = DB = 15 cm[∵AB = 30 cm]
OD = 8 cm
OA = √15² + 8² = √225 + 64
= √289 = 17cm