suppouse that.while lying on a beach near the equator watehing the sun set over a calm ocean,you start a stopwaten just as the top of the sun di sappears you th

suppouse that.while lying on a beach near the equator watehing the sun set over a calm ocean,you start a stopwaten just as the top of the sun di sappears you then stand. elevating your eyes by a beight H.1.70 m. and step the watch when the top of the sun again di sappears if the elapaed time is 11.1 S. what is the radius of earth.