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"Magnification and reduction of graphics" proportion PPT download
Part One: Scenario Introduction
Have you seen the following phenomena? Which of these phenomena are magnifications of objects? Which ones shrink objects?
Magnification and reduction of graphics PPT, part 2: exploring new knowledge
Press 2:1 to draw the enlarged graphics of the following three graphics.
Magnifying according to 2:1 means enlarging the length of each side to twice the original length.
If the two right-angled sides of a triangle are enlarged to twice their original size, will the hypotenuse also become twice their original size?
Observe the enlarged figure and the original figure, compare their interior angles, side lengths, and perimeters. What has changed? What hasn't changed?
What can you find?
If the enlarged square is reduced to 1:3, the rectangle is reduced to 1:4, and the triangle is reduced to 1:2, what will happen to each figure? Draw and see on graph paper.
What else did you discover?
Magnification and reduction of graphics PPT, the third part: applying what you have learned
1. First enlarge the triangle below according to 4:1, and then reduce the enlarged figure according to 1:2.
2. Fill it out.
(1) After the graph is translated and rotated, ( ) changes, ( ) remains unchanged. After the graph is enlarged or reduced, ( ) changes, ( ) remains unchanged.
(2) The school is preparing to publish a handwritten newspaper on environmental protection knowledge. The painting should be copied at a ratio of 1:2 and placed on the handwritten newspaper. It should be adjusted to ( )%.
3. Magnify the rectangle on the left proportionally to get the rectangle on the right, and find the unknown number X. (Unit: cm)
Solution: Let the width of the rectangle be x centimeters.
6:3=42:x
X=126÷6
X=21
Answer: The width of the rectangle is 21 cm.
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For more information about the "Enlargement and Reduction of Proportional Graphics" PPT courseware, please click the "Enlargement and Reduction of Proportional PPT Graphics" PPT tab.
"Magnification and reduction of graphics" scale PPT:
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"Magnification and reduction of graphics" similar graphics PPT courseware 3:
"Amplification and Reduction of Figures" Similar Figures PPT Courseware 3 Learning Objectives 1. Understand the similarity figures and related concepts, and understand that the ratio of the distance between any pair of corresponding points on the similarity figures is equal to the similarity ratio. 2. Be able to Use the method of positioning a figure to place a figure...
"Magnification and reduction of graphics" similar graphics PPT courseware 2:
"Enlarging and Reducing Figures" Similar Figures PPT Courseware 2 Review and Thinking What are similar polygons? What is the similarity ratio of similar polygons? What are some ways to determine if two triangles are similar? Do you still remember the method of using rubber bands to enlarge graphics on page 116 of the third section of this chapter?