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【“望”:病例观察】“三角形的认识”是苏教版教材四年级下册的教学内容。一位教师执教这节课时,上得气喘吁吁,最终还拖课。她是这样设计的——一、生活激趣,引入新课1.摸三角形。教师拿出一个黑布袋,里面有长方形、正方形、三角形、圆形物体,让学生摸出三角形。2.找三角形。(1)教师呈现篮球架图片:你能找到三角形吗?(2)师:在生活中,还有哪些物体的形状是三角形的?课件播放宜昌长江大桥、高压线杆、自行车、房屋的人字梁、雪花等图片。
“” Wang “: Case observation ” Triangle awareness "is the teaching content of the fourth edition of the textbook of the Sujiao version. When a teacher coached this class, he was breathless and eventually dragged. She is so designed - First, the interest of life, the introduction of a new lesson 1. Touch the triangle. The teacher took out a black bag, which has rectangular, square, triangular, circular objects, so that students come up with a triangle. Find a triangle (2) teachers: in life, what other shapes are triangular? Courseware to play Yichang Yangtze River Bridge, high voltage poles, bicycles, housing the I-beam , Snowflakes and other pictures.