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一、题目再现(高中人教A版必修5第18页练习第2题)一块四边形土地的形状如图所示,它的三条边的长度分别是50m,60m,70m,两个内角是127°和132°,求四边形的面积(精确到0.01).分析这是一道生活中的数学题.在翻阅教材时引起了笔者的注意,于是笔者捡回了此题,查阅教师教学用书,可在教参里只提供了答案,没有详细的解答过程,或许该题运算繁杂、方法复杂,或许是练习题
First, the title reproduction (Senior High School taught A version of compulsory 5 Page 18 Practice Question 2) The shape of a quadrangle of land as shown in the figure, the length of its three sides are 50m, 60m, 70m, two internal angle is 127 ° And 132 °, find the area of the quadrilateral (accurate to 0.01) .Analysis This is a math problem in life.While reading the textbook has drawn the attention of the author, so I retrieve this question, access to teachers teaching books, you can teach Senate only provides the answer, there is no detailed answer process, perhaps the problem complex operation, the method is complex, perhaps exercises