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Authoritative PPT Summary
"Drawing Angle" Lines and Angle PPT Courseware
teaching objectives
1. Experience the process of using a protractor and set square to draw angles and communicate how to draw angles.
2. Able to use a protractor to draw angles of specified degrees; able to use a triangle to draw angles of 30°, 45°, 60°, and 90°.
3. Stimulate students' interest in drawing corners and cultivate good qualities of seriousness and carefulness.
Draw an angle of 40°.
(1) Draw a ray so that the center of the protractor coincides with the endpoint of the ray, and the 0° scale line coincides with the ray.
(2) Draw a point at the 40° mark of the protractor.
(3) Taking the endpoint of the drawn ray as the endpoint, draw another ray through the point just drawn.
In conclusion
How to use a protractor to draw an angle of specified degree: first draw a ray so that the center point of the protractor coincides with the end point of the ray, and the 0° scale line coincides with the ray, and then find the specified degree, that is, the 0 corresponding to the drawn ray Wherever the ° scale line is, find the degree based on the scale of that circle, draw a point corresponding to this degree, then take the protractor, take the endpoint of the ray as the endpoint, draw a ray through the point just drawn, and finally draw a ray at the Mark the angle sign and measure in the drawn angle.
practice
1. Use a protractor to draw angles of 55°, 110°, and 65° respectively.
2. Use a triangle to draw angles of 30°, 90°, and 60° respectively.
3*. Try to use a triangle to draw angles of 75°, 105°, and 120°.
4*. Use a square piece of paper and fold out the angles of the following degrees.
45°, 135°, 60°
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