题目

如图，在平面直角坐标系中，A（﹣1，5），B（﹣1，0），C（﹣4，3）．(1)求出△ABC的面积；(2)在图中作出△ABC关于y轴的对称图形△A1B1C1；(3)写出点A1，B1，C1的坐标． 答案：【答案】(1) ；(2)作图略 ；(3)A1(1，5)，B1(1，0)，C1(4，3)【解析】（1）根据网格可以看出三角形的底AB是5，高是C到AB的距离，是3，利用面积公式计算．（2）从三角形的各顶点向y轴引垂线并延长相同长度，找对应点．顺次连接即可．（3）从图中读出新三角形三点的坐标．解答：解：（1）S△ABC=×5×3=（或7.The New York State TheaterCome and enjoy this amazing Chinese play—TeahouseShowing time:8:00a.m.—10:30a.m. Saturday, November 53:00p.m.—5:30p.m. Sunday, November 6Introduction:The play takes place in an old Beijing teahouse. The main characters live in the same neighborhood. They come in and out of the teahouse and chat to each other.It reflects(反映) changes in the lives of almost 70 characters. The first act takes place in 1898. The second act jumps forward 20 years and the final act takes place in 1948.In Teahouse, all types of people come to the teahouse in Beijing. Some come to do business, others come just to sit and pass the time. They meet, they talk, they argue, they gossip(闲聊) and then they get on with their lives.The Teahouse is a favorite work by Lao She. He is a master of 20th century play writing. The play was first performed in 1958. It is still one of the most popular plays in China.Notice:●Anyone who is interested in Chinese life and history should see the play.●To be sure to get a ticket, book now!We’re sure you will have a good time!1.The play Teahouse will be put on in ___________.A. New York B. Beijing C. Toronto D. Moscow2.How long does the play last?A. An hour. B. One and a half hours.C. Two hours. D. Two and a half hours.3.What can be known from the play?A. The types of ancient houses. B. Chinese traditional festivals.C. Chinese history and culture.D. The art of Chinese painting.