3. The focus and difficulty of the textbook
Because the calculation of cylinder volume is the basis of cone volume calculation, the cylinder volume and its application are the teaching focus of this lesson. Among them, the derivation process of cylindrical volume formula is complicated, which needs to be considered by transformation method, and the derivation process should have certain logical reasoning ability. Therefore, the derivation process of cylindrical volume formula is the difficulty of this lesson.
4. Teaching objectives
(1) Knowing the derivation process of the formula for calculating the volume of a cylinder, we will use this formula to calculate the volume of a cylinder.
(2) Initially establish spatial concept and logical reasoning ability.
(3) Know that knowledge can be transformed into each other.
Second, oral teaching methods
Starting from the existing knowledge level and cognitive law, in order to better highlight key points, resolve difficulties and unblock students' cognitive thinking obstacles, in the process of implementing teaching, the following characteristics are mainly reflected:
1. Audio-visual demonstration, operation discovery
Teachers make full use of audio-visual media to demonstrate, guide students to observe and compare, and then let students operate and discuss, so that students can deduce the formula for calculating cylinder volume on the basis of rich perceptual knowledge and under the guidance of teachers. Thus, students can rise from perceptual knowledge to rational knowledge, understand the origin of knowledge, solve practical problems through what they have learned, give full play to the positive role of audio-visual teaching in the process of knowledge formation, and cultivate students' ability and habit of learning mathematics.