题目

One of the best ways to change your looks and improve your health is to lose excessive weight．There are plenty of tips and various techniques to help you cope with the problem． Say good-bye to sugar （36） __．Sugar is added to most products to make themmoreaddictive．People like the sweet taste and get used to eating pretty soon．Do not use sugar at all or minimize its amount while cooking． Enjoys fruits and vegetablesEating fruits and veggies is absolutely necessary when you are on a diet and need minerals，vitamins and other nutrients to stay energetic and alert．（3如图所示，圆是的外接圆，与的平分线相交于点，延长交圆于点，连结．（1）求证：；（2）若圆的半径为10cm，，求的面积．