Optics question. Given Diameter and object distance find image distance.

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The discussion centers on calculating the image distance for a reflective spherical ornament with a diameter of 8.96 cm and an object distance of 9.79 cm. The radius of curvature is essential for this calculation and is determined by halving the diameter. The correct radius of curvature is 4.48 cm. The user initially struggled with the concept but ultimately resolved their query without further assistance.

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An object is 9.79 cm from the surface of a reflective spherical Christmas-tree ornament 8.96 cm in diameter.
What is the position of the image? Answer in units of cm

I know that i need the radius of curvature to find the position of the image, but I'm not sure how to get that from the diameter? I tried just dividing by 2, but it says it is wrong. I just need help on finding the radius of curvature please, thanks!
 
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