《圆的周长》导学案（The guide to the circumference of a circle）.docVIP

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2017-08-02 发布于河南
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《圆的周长》导学案（The guide to the circumference of a circle）.doc

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《圆的周长》导学案（The guide to the circumference of a circle） Collected by oneself Mistakes are unavoidable For reference only In case of error Please correct me! Thank you Circle perimeter teaching case Class five grade 1, Qin Zengqi I. learning goals: 1. let the students know what the circumference of the circle is 2. understand and grasp the meaning and the approximate value of PI 3. preliminary understanding and grasp of the perimeter of the circle formula The circumference of a circle can be correctly calculated 4. cultivate and develop the students spatial concept Train students ability of abstract generalization and solve simple practical problems 5. by Zu Chongzhi made contributions in PI Infiltrate patriotism 6. train students ability of observation, comparison, analysis, synthesis and hands-on operation Teaching emphasis: understand and grasp the calculation formula of the circumference of the circle Two learning difficulties: understanding of PI Study preparation: 1. students prepare one wafer each with a diameter of 5 cm, 6 cm, and 7 cm Objects with a circle, one each Line Ruler Each group prepares a calculator 2. prepare pictures for teachers Three preview the learning plan 1. animal kingdom is holding animal games, it can be lively Would you like to go and have a look? 2. a small goat and a spotted deer run on the round and square tracks respectively Lets calculate. How far did they run? Four inquiry into new knowledge (1) review the perimeter of the square Suppose that the circumference of a circle may be related to anything 1. by comparing the length of the two tracks Can you figure out their perimeter? (if students talk about the shape of corners or lines Take the lead: the square is made up of such 4 lines A circle is made up of a smooth curve ) 2. (answer the circumference of the square) ask, how do you count? (answer the circumference of the square = the side length * 4 divisions on the blackboard c=4a) then tell me what the perimeter of the square has t