“组合图形的面积”教授教化设计_教案 教授教化设_20141124_195510(国外英语资料).doc

“组合图形的面积”教学设计_教案 教学设195510(国外英语资料)Textbooks P92 ~ 93 pages. Teaching objective: 1.. Make students understand the combination graphics according to the reality of life. They will decompose the composite graphics into the learned plane figures and calculate the area. 2., the comprehensive use of plane graphics area calculation knowledge, further development of students spatial concept. 3. cultivate students ability to observe, think independently, cooperate and communicate with each other. Teaching emphasis: master the method of calculating the area of combined graphics. Teaching difficulty: how to calculate the area from the composite graphics to the plane graphics that have been learned. Teaching aids: courseware, several simple flat graphics can be put together. The teaching process: 1. Introduce interest? 1. presented one by one graphic learned, say its name and size formula. Then put the graphics on the blackboard to form a few beautiful patterns. 2. look at these graphs. Whats the difference between them and the graphic patterns youve learned before? Summary: these graphs are made up of several simple flat figures. We call such graphs a composite graph. (writing on the blackboard: a combination of figures) 3. says, where are the living things in combination? What shapes are they made of? (student freedom says) 4. know the combination graphics, so what else do you want to know about combinatorial graphics? (perimeter, area,...) In this lesson we focus on the area of the composite graphics. (blackboard writing: Area) two. Explore new knowledge 1., draw from Figure 1, example 1. (courseware produced), the right picture shows the shape of a house side wall, and its area is square meters? (1) observe the graphics carefully, think independently first, and then talk about your ideas with your deskmate. (2) reporting communication. (combining courseware demonstration) the combination of a graph into a triangle and a square. Formula: 5 * 5 + 5 x 2 / 2? The comb