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Authoritative PPT Summary
"View" Projection and View PPT Courseware (Lesson 2)
learning target
Understanding geometry from three views
Calculation of geometries represented by three views
Gain new knowledge
Knowledge points: Understand geometry from three views
Visualize the geometry from three views:
(1) Method: When imagining a three-dimensional figure from three views, first imagine the front, top and left side of the three-dimensional figure based on the front view, top view, and left view respectively, and then consider the overall figure together.
(2) Process: Imagine the geometric shape from three views, which can be analyzed through the following methods:
①Imagine the shape of the front, upper and left sides of the geometry based on the front view, top view, and left view;
②Imagine the contours of the visible and invisible parts of the geometry based on the solid lines and dotted lines;
③ Memorizing the three-dimensional views of some simple geometries will be helpful for imagining complex geometries;
④Use the reciprocal process of drawing three-view geometry from geometry and drawing geometry from three-view, practice repeatedly, and constantly summarize the method.
Knowledge point Calculation of geometry represented by three views
To calculate the surface area or volume of a geometric body from three views, you must first restore the geometry from three views, and then determine the composition of the surface area or the calculation method of the volume of the geometry. Finally use the formula to calculate.
Class summary
1. What did you gain from studying this class?
2. When imagining the shape of a three-dimensional figure from the three views of a three-dimensional figure, do you have any good ideas? Communicate with your peers.
Keywords: Beijing Normal University Edition Ninth Grade Volume 1 Mathematics PPT courseware free download, view PPT download, projection and view PPT download, .PPT format;
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