星期六的晚上,我们一家三口吃完晚饭出去散步,走在橙黄色的路灯下,我们的影子变成各种奇怪的模样,有长长细细的,有矮矮胖胖的,真好玩。爸爸趁机给我出了一道关于投影的题目。爸爸让妈妈先走了几米,然后开始出题。假设爸爸和妈妈之间的距离为S_1米,在路灯的照射下,爸爸的投影为A,妈妈的投影为B,爸爸和妈妈 On Saturday night, our family of three went out for a walk after eating dinner, and under the orange street lights, our shadows became strangely shaped. There were long, thin, short, fat and fun ones. Dad took the opportunity to give me a topic on the projection. Dad let mom go a few meters, and then began to question. Suppose the distance between father and mother is S_1 m, under the illumination of the street lamp, the projection of father is A, the projection of mother is B, father and mother