"Parallel Projection" PPT Courseware 2

Description

"Parallel Projection" PPT Courseware 2

In parallel projection, when the projection line is perpendicular to the projection surface, the projection of the geometry in the projection surface is called orthographic projection.

Explore new knowledge

Place a line segment AB in three different locations:

(1) The line segment is parallel to the projection surface.

(2) The line segment is inclined to the projection surface.

(3) The line segment is perpendicular to the projection surface.

As shown in the figure, place a parallelogram ABCD in three different positions:

(1) The cardboard is parallel to the projection surface;

(2) The cardboard is tilted to the projection surface;

(3) The cardboard is perpendicular to the projection surface.

What are the shapes of the orthographic projections in the three cases?

The rules of orthographic projection:

When an object is parallel to the projection plane, its orthographic projection is _______ with the shape and size of the original object;

When an object is tilted to the projection plane, its orthographic projection is _______ with the shape and size of the original object;

When an object is perpendicular to the projection surface, its orthographic projection forms _______.

The parallel shape remains unchanged, the oblique shape changes, and the vertical shape becomes a line segment.

Instructions and advice

Example: Draw the orthographic projection of the cube placed as shown in the figure on the projection plane V.

(1) One face ABCD of the cube is parallel to the projection plane V;

(2) One face ABCD of the cube is inclined to the projection plane V, and the upper bottom face ADEF is perpendicular to the projection plane V.

Class summary

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"Parallel Projection" PPT courseware:

"Parallel Projection" PPT courseware learning objectives 1. Explore the formation of shadows of objects, identify the shadow of real objects according to the direction of light, and initially experience the mutual transformation between objects and shadows under parallel projection; 2. Understand objects at different times through accumulation of activities Under the sun...

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Update Time: 2024-11-20

This template belongs to Mathematics courseware Qingdao Edition Ninth Grade Mathematics Volume 2 industry PPT template

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