"Comparison of Angles" Basic Plane Graphics PPT Courseware

"Comparison of Angles" Basic Plane Graphics PPT Courseware

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"Comparison of Angles" Basic Plane Graphics PPT Courseware

Review: How to compare the length of two line segments?

1. Measurement method: Use a scale to measure the length of a line segment.

2. Superposition method: move one line segment to another line segment for comparison.

Question: How to compare the size of two angles?

1. Measurement method:

1. "Middle" - the vertex of the angle to the center of the protractor

2. Coincidence—one side of the angle coincides with the zero line of the protractor

3. Reading—Read the degree subtended by the other side of the angle.

Example: calculation

(1) How many minutes is 1.45° equal to? How many seconds is it equal to?

(2) How many minutes is 2400″? How many degrees is it?

(3) 3.58°+ 7°24′30″

2. Superposition method

1. Align the vertices and one side of the two angles

2. The other sides of the two angles fall on the same side of the overlapping side.

3. Determine the size of the two angles based on the position of the other side of the two angles

discount

Draw a corner on the paper and cut it out. Fold it in half so that the two sides overlap. What is the relationship between the fold and the size of the two angles formed by the two sides of the corner?

give your choice

In the following formula, the equation that can express "OC is the angle bisector of ∠ AOB" is ()

A, 2 ∠ AOC= ∠ BOC

B. ∠ AOC=1/2∠ AOB

C. ∠ AOB=2 ∠ BOC

D. ∠ AOC= ∠ BOC

summary

1. Methods for comparing angle sizes: measurement method, superposition method

2. The angles that can be made from triangular plates

3. Angle bisector

4. Conversion of angles

Keywords: basic plane graphics courseware, comparison of angles courseware, Beijing Normal University edition seventh grade mathematics volume PPT courseware, seventh grade mathematics slide courseware download, basic plane graphics PPT courseware download, comparison of angles PPT courseware download, .ppt format

For more information about the "Comparison of Angle of Basic Plane Figures" PPT courseware, please click on the "Comparison of Angle of Basic Plane Figures" PPT tab.

"Comparison of Angles" Basic Plane Graphics PPT Download:

"Comparison of Angles" Basic Plane Graphics PPT Download Part One Content: Learning Objectives 1. Experience the research process of comparing the sizes of angles, and experience the consistency of the comparison methods of angles and line segments; (Key Points) 2. Be able to compare the sizes of angles , can estimate the size of an angle;..

"Comparison of Angles" Basic Plane Graphics PPT:

"Comparison of Angles" Basic Plane Figures PPT Part 1 Content: Knowledge Points Basic Knowledge Point 1 Comparison of Angles 1. Which of the following statements is correct (C) A. The longer the two sides of an angle, the larger the angle B. The size of the angle and The direction of the angle is related to C. A magnifying glass cannot measure the degree of an angle..

"Comparison and Operation of Angles" Preliminary PPT Courseware on Geometric Figures:

"Comparison and Operation of Angles" Preliminary PPT Courseware on Geometric Figures Part One: Knowledge Review How to Measure the Lengths of Two Line Segments: Use a ruler to measure the lengths of two line segments, and then compare them. Superposition method: Put two line segments on a straight line, and the line segments...

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