The length of the chord of a circle is 8 cm and perpendicular

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The length of the chord of a circle is 8 cm and perpendicular distance between centre and the chord is 3 cm. Then the radius of the circle is equal to :

1. 4 cm
2. 5 cm
3. 6 cm
4. 8 cm

Correct Option: B

On the basis of question we draw a figure of circle with O centre ,

AC = CB = 4 cm
OC = 3 cm
∴ OA = √OC² + CA²
OA = √3² + 4²
OA = √9 + 16
OA = √25 = 5 cm