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【案例】圆柱体侧面积教学师:请拿出侧面围满商标纸的圆柱体,指出它的侧面。(学生拿出自带的侧面围满商标纸的圆柱体,摸一摸侧面)师:猜想:侧面展开是什么形状的?生:长方形。生:也可能是正方形。师:猜想对吗?怎样验证?生:把商标纸撕下来。生:把商标纸剪下来。生:在桌面上滚动一圈留下的痕迹。师:同桌一起展
【Case】 Cylinder Side Area Instructor: Please take out the side of the cylinder filled with trademark paper, pointed out its side. (Students take out the side of the cylinder filled with trademark paper, touch the side) Teacher: guess: What is the shape of the side of the expansion? Students: Rectangular. Health: It may be square. Teacher: guess right? How to verify? Health: tear off the trademark paper. Students: cut the trademark paper. Health: Traces left on the desktop. Teacher: show together at the table