Question

A child looks into a shiny, spherical, Christmas tree ornament with a diameter of 9.00 cm and sees an image of her face that is half the real size

A child looks into a shiny, spherical, Christmas tree ornament with a diameter of 9.00 cm and sees an image of her face that is half the real size. If her face is 19.0 cm tall, how far is her face from the ornament?

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