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"Application of Proportion" Proportion PPT Courseware 4
1. Explore new knowledge
Have you seen the following phenomena?
Which of these phenomena are magnifications of objects? Which ones shrink objects?
Magnifying according to 2:1 means enlarging the length of each side to twice the original length.
If the two right-angled sides of the triangle are enlarged to twice their original size, will the hypotenuse also become twice their original size?
2. Application of knowledge
First enlarge the triangle below by 4:1, and then reduce the enlarged figure by 1:2.
Which of the following figures is the figure obtained by enlarging figure A by 2:1?
Only the width is expanded to 2 times the original, and the height remains unchanged.
(1) The figure ( ) is the enlarged figure of the rectangle ①. It is enlarged according to the ratio ( ): ( ).
(2) The figure ( ) is the reduced figure of the rectangle ①. It is reduced according to the ratio ( ): ( ).
3. Assign homework
Homework: Page 63, Exercise 11, Question 2.
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