“三勤四环节教学”是河南省鹤壁市的实验研究课题,其中的“三勤”是指勤动脑、勤动口、勤动手,课堂上让每个学生勤动脑会思考,勤动手会操作,勤动口善表达;“四环节”是指定向诱导、自学探究、讨论解疑、反馈总结,是学生脑、口、手活动的载体。“梯形的面积”是该课题实验研究中的一个典型课例。 “Three aspects and four links teaching ” is an experimental research subject in Hebi City, Henan Province, where “Three pairs of ground ” refers to diligent brain, diligent mouth, hands-on, let students think hard in the classroom, Hands-on operation, diligent and mouth-good expression; “Four links ” refers to the orientation-induced, self-study, discuss the solution, feedback summary, is the brain, mouth, hand activities of the carrier. “Area of ​​trapezoid ” is a typical example in the experimental research of this subject.